chore(package): update @types/webpack-dev-middleware to version 3.7.1

Closes #12

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "@glints/tslint-rules": "^1.0.6",
     "@types/hapi__hapi": "^18.2.6",
     "@types/webpack": "^4.39.8",
-    "@types/webpack-dev-middleware": "^2.0.3",
+    "@types/webpack-dev-middleware": "^3.7.1",
     "@types/webpack-hot-middleware": "^2.16.5",
     "tslint": "^5.20.1",
     "typescript": "^3.7.2"