[tools] Add script for linting and update travis

Author: eliamaino-fp

.travis.yml

@@ -1,5 +1,6 @@
 language: node_js
 node_js:
-  - 8.9.4
+  - 10.15.0
 script:
-  - "eslint . --max-warnings 0"
+  - npm run lint
+  - npm test

package.json

@@ -28,9 +28,10 @@
     "dist/vast-client.min.js": "dist/vast-client.min.js"
   },
   "scripts": {
-    "test": "mocha --compilers js:babel-core/register --reporter spec test/*.js",
     "build": "rollup -c",
-    "precommit": "eslint . --max-warnings 0 && pretty-quick --staged"
+    "lint": "eslint .",
+    "precommit": "eslint . --max-warnings 0 && pretty-quick --staged",
+    "test": "mocha --compilers js:babel-core/register --reporter spec test/*.js"
   },
   "devDependencies": {
     "babel-core": "^6.26.0",