react.rb in webpacker-3.2.1

- old
+ new

@@ -20,9 +20,12 @@
 end
 
 say "Copying react example entry file to #{Webpacker.config.source_entry_path}"
 copy_file "#{__dir__}/examples/react/hello_react.jsx", "#{Webpacker.config.source_entry_path}/hello_react.jsx"
 
+say "Updating webpack paths to include .jsx file extension"
+insert_into_file Webpacker.config.config_path, "    - .jsx\n", after: /extensions:\n/
+
 say "Installing all react dependencies"
 run "yarn add react react-dom babel-preset-react prop-types"
 
 say "Webpacker now supports react.js 🎉", :green