webpack.md in ajax-datatables-rails-1.1.0

- old
+ new

@@ -3,10 +3,12 @@
 We assume here that Bootstrap and FontAwesome are already installed with Webpack.
 
 Inspired by https://datatables.net/download and completed :
 
 Add npm packages :
-
+```sh
+$ yarn add imports-loader
+```
 ```sh
 $ yarn add datatables.net
 $ yarn add datatables.net-bs
 $ yarn add datatables.net-buttons
 $ yarn add datatables.net-buttons-bs