Add yarn and webpack recommendation (#2458)

README.md

@@ -2,6 +2,8 @@
 
 > Bower needs your help. If you're willing to help, please say hello to team@bower.io or [donate](https://salt.bountysource.com/teams/bower)
 
+> ..psst! While Bower is maintained, we recommend [yarn](https://yarnpkg.com/) and [webpack](https://webpack.js.org/) for new front-end projects!
+
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