add linter to travis

Author: kevinongko

.travis.yml

@@ -6,4 +6,6 @@ node_js:
 before_script:
   - yarn install
 
-script: yarn run test
+script:
+  - yarn run lint
+  - yarn run test

package.json

@@ -29,18 +29,18 @@
   },
   "scripts": {
     "test": "karma start",
-    "test:watch": "karma start --single-run=false"
+    "test:watch": "karma start --single-run=false",
+    "lint": "eslint --ext .js,.vue src spec"
   },
   "devDependencies": {
     "babel-core": "^6.25.0",
-    "babel-eslint": "^7.2.3",
     "babel-loader": "^7.0.0",
     "babel-preset-es2015": "^6.24.1",
     "babel-register": "^6.24.1",
     "cross-env": "^5.0.1",
-    "eslint": "^3.19.0",
+    "eslint": "^4.0.0",
     "eslint-config-vue": "^2.0.2",
-    "eslint-plugin-vue": "^2.0.1",
+    "eslint-plugin-vue": "2.1.0",
     "jasmine": "^2.6.0",
     "karma": "^1.7.0",
     "karma-chrome-launcher": "^2.1.1",
@@ -52,7 +52,7 @@
     "vue-loader": "^12.2.1",
     "vue-router": "^2.6.0",
     "vue-template-compiler": "^2.3.4",
-    "webpack": "^3.0.0",
+    "webpack": "2.6.1",
     "webpack-dev-server": "^2.4.5"
   }
 }