Use coffeescript, not coffee-script

Avoids the following warning:

> npm WARN deprecated [email protected]: CoffeeScript on NPM has moved to "coffeescript" (no hyphen)

Author: malept

package.json

@@ -32,7 +32,7 @@
     "babel-preset-env": "^1.3.2",
     "btoa": "^1.1.2",
     "cheerio": "^0.20.0",
-    "coffee-script": "^1.10.0",
+    "coffeescript": "^1.10.0",
     "cson": "^3.0.2",
     "debug": "^2.5.1",
     "detective-less": "^1.0.0",