chore(package): update coffee-script to version 1.12.3 (#321)

Author: greenkeeperio-bot

package.json

@@ -13,7 +13,7 @@
     "accord": "0.26.3",
     "autoprefixer-stylus": "0.13.0",
     "chai": "3.5.0",
-    "coffee-script": "1.12.1",
+    "coffee-script": "1.12.3",
     "css-parse": "2.0.0",
     "mocha": "3.2.0",
     "stylus": "0.54.5"