fix(package): update webpack-hot-middleware to version 2.22.2

Closes #57

Author: greenkeeper[bot]

package.json

@@ -52,7 +52,7 @@
   },
   "dependencies": {
     "webpack-dev-middleware": "1.12.0",
-    "webpack-hot-middleware": "2.18.2",
+    "webpack-hot-middleware": "2.22.2",
     "regenerator-runtime": "0.10.5"
   }
 }