diff --git a/package-lock.json b/package-lock.json
index 8336833..a6e3bb9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -246,80 +246,6 @@
         }
       }
     },
-    "babel-core": {
-      "version": "6.26.3",
-      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.3.tgz",
-      "integrity": "sha512-6jyFLuDmeidKmUEb3NM+/yawG0M2bDZ9Z1qbZP59cyHLz8kYGKYwpJP0UwUKKUiTRNvxfLesJnTedqczP7cTDA==",
-      "dev": true,
-      "requires": {
-        "babel-code-frame": "^6.26.0",
-        "babel-generator": "^6.26.0",
-        "babel-helpers": "^6.24.1",
-        "babel-messages": "^6.23.0",
-        "babel-register": "^6.26.0",
-        "babel-runtime": "^6.26.0",
-        "babel-template": "^6.26.0",
-        "babel-traverse": "^6.26.0",
-        "babel-types": "^6.26.0",
-        "babylon": "^6.18.0",
-        "convert-source-map": "^1.5.1",
-        "debug": "^2.6.9",
-        "json5": "^0.5.1",
-        "lodash": "^4.17.4",
-        "minimatch": "^3.0.4",
-        "path-is-absolute": "^1.0.1",
-        "private": "^0.1.8",
-        "slash": "^1.0.0",
-        "source-map": "^0.5.7"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "2.6.9",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
-          "dev": true,
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
-      }
-    },
-    "babel-generator": {
-      "version": "6.26.1",
-      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
-      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
-      "dev": true,
-      "requires": {
-        "babel-messages": "^6.23.0",
-        "babel-runtime": "^6.26.0",
-        "babel-types": "^6.26.0",
-        "detect-indent": "^4.0.0",
-        "jsesc": "^1.3.0",
-        "lodash": "^4.17.4",
-        "source-map": "^0.5.7",
-        "trim-right": "^1.0.1"
-      },
-      "dependencies": {
-        "jsesc": {
-          "version": "1.3.0",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-1.3.0.tgz",
-          "integrity": "sha1-RsP+yMGJKxKwgz25vHYiF226s0s=",
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
-      }
-    },
     "babel-helper-call-delegate": {
       "version": "6.24.1",
       "resolved": "https://registry.npmjs.org/babel-helper-call-delegate/-/babel-helper-call-delegate-6.24.1.tgz",
@@ -412,16 +338,6 @@
         "babel-types": "^6.24.1"
       }
     },
-    "babel-helpers": {
-      "version": "6.24.1",
-      "resolved": "https://registry.npmjs.org/babel-helpers/-/babel-helpers-6.24.1.tgz",
-      "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
-      "dev": true,
-      "requires": {
-        "babel-runtime": "^6.22.0",
-        "babel-template": "^6.24.1"
-      }
-    },
     "babel-messages": {
       "version": "6.23.0",
       "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
@@ -741,21 +657,6 @@
         "babel-plugin-transform-regenerator": "^6.24.1"
       }
     },
-    "babel-register": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-register/-/babel-register-6.26.0.tgz",
-      "integrity": "sha1-btAhFz4vy0htestFxgCahW9kcHE=",
-      "dev": true,
-      "requires": {
-        "babel-core": "^6.26.0",
-        "babel-runtime": "^6.26.0",
-        "core-js": "^2.5.0",
-        "home-or-tmp": "^2.0.0",
-        "lodash": "^4.17.4",
-        "mkdirp": "^0.5.1",
-        "source-map-support": "^0.4.15"
-      }
-    },
     "babel-runtime": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
@@ -1240,12 +1141,6 @@
       "integrity": "sha1-vXJ6f67XfnH/OYWskzUakSczrQ8=",
       "dev": true
     },
-    "convert-source-map": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.5.1.tgz",
-      "integrity": "sha1-uCeAl7m8IpNl3lxiz1/K7YtVmeU=",
-      "dev": true
-    },
     "copy-descriptor": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
@@ -1400,15 +1295,6 @@
       "resolved": "https://registry.npmjs.org/detect-conflict/-/detect-conflict-1.0.1.tgz",
       "integrity": "sha1-CIZXpmqWHAUBnbfEIwiDsca0F24="
     },
-    "detect-indent": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-4.0.0.tgz",
-      "integrity": "sha1-920GQ1LN9Docts5hnE7jqUdd4gg=",
-      "dev": true,
-      "requires": {
-        "repeating": "^2.0.0"
-      }
-    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
@@ -2493,13 +2379,10 @@
       }
     },
     "grunt-babel": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/grunt-babel/-/grunt-babel-6.0.0.tgz",
-      "integrity": "sha1-N4GJtIfeEWjExKn8iN1gBbNd+WA=",
-      "dev": true,
-      "requires": {
-        "babel-core": "^6.0.12"
-      }
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-babel/-/grunt-babel-8.0.0.tgz",
+      "integrity": "sha512-WuiZFvGzcyzlEoPIcY1snI234ydDWeWWV5bpnB7PZsOLHcDsxWKnrR1rMWEUsbdVPPjvIirwFNsuo4CbJmsdFQ==",
+      "dev": true
     },
     "grunt-contrib-clean": {
       "version": "1.1.0",
@@ -2724,16 +2607,6 @@
         }
       }
     },
-    "home-or-tmp": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/home-or-tmp/-/home-or-tmp-2.0.0.tgz",
-      "integrity": "sha1-42w/LSyufXRqhX440Y1fMqeILbg=",
-      "dev": true,
-      "requires": {
-        "os-homedir": "^1.0.0",
-        "os-tmpdir": "^1.0.1"
-      }
-    },
     "hooker": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/hooker/-/hooker-0.2.3.tgz",
@@ -3151,12 +3024,6 @@
       "integrity": "sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=",
       "dev": true
     },
-    "json5": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/json5/-/json5-0.5.1.tgz",
-      "integrity": "sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=",
-      "dev": true
-    },
     "kind-of": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-1.1.0.tgz",
@@ -7555,23 +7422,6 @@
         "urix": "^0.1.0"
       }
     },
-    "source-map-support": {
-      "version": "0.4.18",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
-      "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
-      "dev": true,
-      "requires": {
-        "source-map": "^0.5.6"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
-      }
-    },
     "source-map-url": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz",
@@ -7895,12 +7745,6 @@
       "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
       "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM="
     },
-    "trim-right": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
-      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
-      "dev": true
-    },
     "tslib": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
diff --git a/package.json b/package.json
index bd306a0..5ecc62f 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "eslint-config-airbnb-base": "^11.2.0",
     "eslint-plugin-import": "^2.6.1",
     "grunt": "^1.0.1",
-    "grunt-babel": "^6.0.0",
+    "grunt-babel": "^8.0.0",
     "grunt-contrib-clean": "^1.1.0",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-copy": "^1.0.0",
diff --git a/yarn.lock b/yarn.lock
index a10bcce..95174ec 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -115,43 +115,6 @@ babel-code-frame@^6.22.0:
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
-babel-core@^6.0.12, babel-core@^6.24.1:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.25.0.tgz#7dd42b0463c742e9d5296deb3ec67a9322dad729"
-  dependencies:
-    babel-code-frame "^6.22.0"
-    babel-generator "^6.25.0"
-    babel-helpers "^6.24.1"
-    babel-messages "^6.23.0"
-    babel-register "^6.24.1"
-    babel-runtime "^6.22.0"
-    babel-template "^6.25.0"
-    babel-traverse "^6.25.0"
-    babel-types "^6.25.0"
-    babylon "^6.17.2"
-    convert-source-map "^1.1.0"
-    debug "^2.1.1"
-    json5 "^0.5.0"
-    lodash "^4.2.0"
-    minimatch "^3.0.2"
-    path-is-absolute "^1.0.0"
-    private "^0.1.6"
-    slash "^1.0.0"
-    source-map "^0.5.0"
-
-babel-generator@^6.25.0:
-  version "6.25.0"
-  resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.25.0.tgz#33a1af70d5f2890aeb465a4a7793c1df6a9ea9fc"
-  dependencies:
-    babel-messages "^6.23.0"
-    babel-runtime "^6.22.0"
-    babel-types "^6.25.0"
-    detect-indent "^4.0.0"
-    jsesc "^1.3.0"
-    lodash "^4.2.0"
-    source-map "^0.5.0"
-    trim-right "^1.0.1"
-
 babel-helper-call-delegate@^6.24.1:
   version "6.24.1"
   resolved "https://registry.yarnpkg.com/babel-helper-call-delegate/-/babel-helper-call-delegate-6.24.1.tgz#ece6aacddc76e41c3461f88bfc575bd0daa2df8d"
@@ -220,13 +183,6 @@ babel-helper-replace-supers@^6.24.1:
     babel-traverse "^6.24.1"
     babel-types "^6.24.1"
 
-babel-helpers@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-helpers/-/babel-helpers-6.24.1.tgz#3471de9caec388e5c850e597e58a26ddf37602b2"
-  dependencies:
-    babel-runtime "^6.22.0"
-    babel-template "^6.24.1"
-
 babel-messages@^6.23.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-messages/-/babel-messages-6.23.0.tgz#f3cdf4703858035b2a2951c6ec5edf6c62f2630e"
@@ -460,18 +416,6 @@ babel-preset-es2015@^6.24.1:
     babel-plugin-transform-es2015-unicode-regex "^6.24.1"
     babel-plugin-transform-regenerator "^6.24.1"
 
-babel-register@^6.24.1:
-  version "6.24.1"
-  resolved "https://registry.yarnpkg.com/babel-register/-/babel-register-6.24.1.tgz#7e10e13a2f71065bdfad5a1787ba45bca6ded75f"
-  dependencies:
-    babel-core "^6.24.1"
-    babel-runtime "^6.22.0"
-    core-js "^2.4.0"
-    home-or-tmp "^2.0.0"
-    lodash "^4.2.0"
-    mkdirp "^0.5.1"
-    source-map-support "^0.4.2"
-
 babel-runtime@^6.18.0, babel-runtime@^6.22.0:
   version "6.23.0"
   resolved "https://registry.yarnpkg.com/babel-runtime/-/babel-runtime-6.23.0.tgz#0a9489f144de70efb3ce4300accdb329e2fc543b"
@@ -479,7 +423,7 @@ babel-runtime@^6.18.0, babel-runtime@^6.22.0:
     core-js "^2.4.0"
     regenerator-runtime "^0.10.0"
 
-babel-template@^6.24.1, babel-template@^6.25.0:
+babel-template@^6.24.1:
   version "6.25.0"
   resolved "https://registry.yarnpkg.com/babel-template/-/babel-template-6.25.0.tgz#665241166b7c2aa4c619d71e192969552b10c071"
   dependencies:
@@ -754,10 +698,6 @@ content-type@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/content-type/-/content-type-1.0.2.tgz#b7d113aee7a8dd27bd21133c4dc2529df1721eed"
 
-convert-source-map@^1.1.0:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.5.0.tgz#9acd70851c6d5dfdd93d9282e5edf94a03ff46b5"
-
 core-js@^2.4.0:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.4.1.tgz#4de911e667b0eae9124e34254b53aea6fc618d3e"
@@ -818,7 +758,7 @@ dateformat@~1.0.12:
     get-stdin "^4.0.1"
     meow "^3.3.0"
 
-debug@^2.0.0, debug@^2.1.0, debug@^2.1.1, debug@^2.2.0, debug@^2.6.8:
+debug@^2.0.0, debug@^2.1.0, debug@^2.2.0, debug@^2.6.8:
   version "2.6.8"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
   dependencies:
@@ -868,12 +808,6 @@ detect-conflict@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/detect-conflict/-/detect-conflict-1.0.1.tgz#088657a66a961c05019db7c4230883b1c6b4176e"
 
-detect-indent@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/detect-indent/-/detect-indent-4.0.0.tgz#f76d064352cdf43a1cb6ce619c4ee3a9475de208"
-  dependencies:
-    repeating "^2.0.0"
-
 diff@^2.1.2:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/diff/-/diff-2.2.3.tgz#60eafd0d28ee906e4e8ff0a52c1229521033bf99"
@@ -1404,11 +1338,9 @@ grouped-queue@^0.3.0:
   dependencies:
     lodash "^4.17.2"
 
-grunt-babel@^6.0.0:
-  version "6.0.0"
-  resolved "https://registry.yarnpkg.com/grunt-babel/-/grunt-babel-6.0.0.tgz#378189b487de1168c4c4a9fc88dd6005b35df960"
-  dependencies:
-    babel-core "^6.0.12"
+grunt-babel@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/grunt-babel/-/grunt-babel-8.0.0.tgz#92ef63aafadf938c488dc2f926ac9846e0c93d1b"
 
 grunt-cli@~1.2.0:
   version "1.2.0"
@@ -1570,13 +1502,6 @@ has@^1.0.1:
   dependencies:
     function-bind "^1.0.2"
 
-home-or-tmp@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/home-or-tmp/-/home-or-tmp-2.0.0.tgz#e36c3f2d2cae7d746a857e38d18d5f32a7882db8"
-  dependencies:
-    os-homedir "^1.0.0"
-    os-tmpdir "^1.0.1"
-
 hooker@~0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/hooker/-/hooker-0.2.3.tgz#b834f723cc4a242aa65963459df6d984c5d3d959"
@@ -1815,10 +1740,6 @@ jschardet@^1.4.2:
   version "1.4.2"
   resolved "https://registry.yarnpkg.com/jschardet/-/jschardet-1.4.2.tgz#2aa107f142af4121d145659d44f50830961e699a"
 
-jsesc@^1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-1.3.0.tgz#46c3fec8c1892b12b0833db9bc7622176dbab34b"
-
 jsesc@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
@@ -1831,10 +1752,6 @@ json-stable-stringify-without-jsonify@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz#9db7b59496ad3f3cfef30a75142d2d930ad72651"
 
-json5@^0.5.0:
-  version "0.5.1"
-  resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
-
 levn@^0.3.0, levn@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
@@ -2238,7 +2155,7 @@ os-shim@^0.1.2:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/os-shim/-/os-shim-0.1.3.tgz#6b62c3791cf7909ea35ed46e17658bb417cb3917"
 
-os-tmpdir@^1.0.1, os-tmpdir@~1.0.1:
+os-tmpdir@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
@@ -2655,23 +2572,13 @@ signal-exit@^3.0.0, signal-exit@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
-slash@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/slash/-/slash-1.0.0.tgz#c41f2f6c39fc16d1cd17ad4b5d896114ae470d55"
-
 slice-ansi@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-1.0.0.tgz#044f1a49d8842ff307aad6b505ed178bd950134d"
   dependencies:
     is-fullwidth-code-point "^2.0.0"
 
-source-map-support@^0.4.2:
-  version "0.4.15"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.4.15.tgz#03202df65c06d2bd8c7ec2362a193056fef8d3b1"
-  dependencies:
-    source-map "^0.5.6"
-
-source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6:
+source-map@^0.5.3:
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
 
@@ -2878,10 +2785,6 @@ trim-newlines@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-1.0.0.tgz#5887966bb582a4503a41eb524f7d35011815a613"
 
-trim-right@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
-
 tryit@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/tryit/-/tryit-1.0.3.tgz#393be730a9446fd1ead6da59a014308f36c289cb"