fix(package): update react-hot-loader to version 4.3.4

Closes #98

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "postcss-loader": "1.1.1",
     "progress": "^1.1.8",
     "promise": "^7.1.1",
-    "react-hot-loader": "^3.0.0-beta.6",
+    "react-hot-loader": "^4.3.4",
     "read-metadata": "^1.0.0",
     "recursive-readdir": "^2.1.0",
     "replace-ext": "^1.0.0",