chore(package): update react-hot-loader to version 4.1.0

Closes #524

Author: greenkeeper[bot]

package.json

@@ -78,7 +78,7 @@
     "react": "^16.0.0",
     "react-bootstrap": "^0.31.0",
     "react-dom": "^16.0.0",
-    "react-hot-loader": "3.1.3",
+    "react-hot-loader": "4.1.0",
     "react-prism": "^4.3.0",
     "react-router": "^4.1.1",
     "react-router-dom": "^4.1.1",