Fixes Travis CI build process (#48)

* 🐛 Fixing CI throwing “Cannot start Chrome” in test

* travis enable node_modules cache

* Travis - update addons usage of chrome

* Travis - don’t think you need to install global packages

* ➕ eslint as a devDependency for CI

.travis.yml

@@ -1,16 +1,15 @@
-sudo: false
+sudo: required
 dist: trusty
 language: node_js
 node_js:
   - 6
+cache:
+  directories:
+  - node_modules
 addons:
-  apt:
-    packages:
-      - google-chrome-stable
+  chrome: stable
 before_install:
   - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
   - sleep 3
-before_script:
-  - npm i -g karma karma-cli eslint babel-eslint

package.json

@@ -47,6 +47,7 @@
     "babel-eslint": "^7.2.3",
     "browser-sync": "^2.18.8",
     "chai": "^3.5.0",
+    "eslint": "^4.18.2",
     "karma": "^1.6.0",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.0.0",