chore(package): update webpack-dev-middleware to version 2.0.6

Closes #6

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "ts-loader": "^2.3.1",
     "typescript": "^2.4.2",
     "webpack": "^3.3.0",
-    "webpack-dev-middleware": "^1.5.1",
+    "webpack-dev-middleware": "^2.0.6",
     "webpack-dev-server": "^2.6.0",
     "webpack-notifier": "^1.3.0"
   }