fix(package): update react-hot-loader to version 4.12.12

Closes #18

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
         "qs": "6.5.0",
         "react": "^16.1.0",
         "react-dom": "^16.1.0",
-        "react-hot-loader": "^3.0.0-beta.7",
+        "react-hot-loader": "^4.12.12",
         "react-redux": "^5.0.6",
         "react-router-component": "^0.39.0",
         "react-test-renderer": "^16.1.0",