remove coffee-formatter, added coffeelint on test

.travis.yml

@@ -82,8 +82,6 @@ before_install:
   - composer install
   # NPM Version
   - npm i -g npm@5.7
-  # CoffeeScript
-  - npm install coffee-formatter
   # OCaml
   # - opam init --auto-setup
   # Init environment variables for opam

package.json

@@ -456,6 +456,7 @@
     "prepare": "npm run docs",
     "lint": "coffeelint src/ spec/",
     "code-docs": "codo && open docs/code/index.html",
+    "pretest": "npm lint",
     "test": "atom --test spec"
   },
   "config": {