[Improvement] use ChromeHeadless instead of PhantomJS to run test cases (#913)

package.json

@@ -73,7 +73,7 @@
     "css-loader": "^0.28.11",
     "dependency-tree": "^6.1.0",
     "eslint": "^4.19.1",
-    "eslint-plugin-vue": "^4.4.0",
+    "eslint-plugin-vue": "^4.5.0",
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "fast-vue-md-loader": "^1.0.3",
     "gh-pages": "^1.0.0",
@@ -87,7 +87,7 @@
     "karma-phantomjs-launcher": "^1.0.4",
     "karma-sinon-chai": "^1.3.4",
     "karma-spec-reporter": "^0.0.32",
-    "karma-webpack": "2.0.13",
+    "karma-webpack": "3.0.0",
     "lint-staged": "^7.0.4",
     "mocha": "^5.1.1",
     "postcss": "^6.0.21",
@@ -112,7 +112,7 @@
     "vue-template-compiler": "2.5.16",
     "vue-template-es2015-compiler": "^1.6.0",
     "webpack": "^4.6.0",
-    "webpack-cli": "^2.0.14",
+    "webpack-cli": "^2.0.15",
     "webpack-dev-server": "3.1.3",
     "webpack-merge": "^4.1.2"
   }