fix: disable RHL when HMR is not activated (#863)

Author: theKashey

Diff for: index.js

@@ -1,6 +1,6 @@
 'use strict'
 
-if (process.env.NODE_ENV === 'production') {
+if (!module.hot || process.env.NODE_ENV === 'production') {
   module.exports = require('./dist/react-hot-loader.production.min.js');
 } else {
   module.exports = require('./dist/react-hot-loader.development.js');