chore(package): update webpack-dev-server to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "tslint-loader": "^3.5.3",
     "typescript": "^2.7.2",
     "webpack": "^4.0.0",
-    "webpack-dev-server": "^2.11.1"
+    "webpack-dev-server": "^3.0.0"
   },
   "dependencies": {
     "@types/lovefield": "^2.1.1",