Add format checks to travis

Author: jeremenichelli

.gitignore

@@ -7,7 +7,7 @@ npm_debug.log
 npm-debug.log
 
 # ignore dist folder
-dist/
+dist
 
 # OS X
 .DS_Store

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
   - "7.10.0"
-script: npm run minify
+script: npm run listdiff && npm run minify

dist/smoothscroll.js

@@ -34,12 +34,13 @@
     "build": "rollup -c rollup.config.js",
     "preminify": "npm run build",
     "minify": "uglifyjs dist/smoothscroll.js -c -m -o dist/smoothscroll.min.js --verbose",
+    "listdiff": "prettier --list-different src/**/*.js",
     "format": "prettier --write src/**/*.js"
   },
   "lint-staged": {
     "linters": {
       "src/**/*.js": [
-        "prettier --list-different",
+        "npm run listdiff",
         "git add"
       ]
     }