Update Rooftop Ruby URL to use www

Author: collindonnell

en/community/podcasts/index.md

@@ -29,7 +29,7 @@ wisdom to share, get in touch with the creators of these shows.
 
 You can also start your own Ruby podcast and get added to this list!
 
-[rooftop_ruby]: https://rooftopruby.com
+[rooftop_ruby]: https://www.rooftopruby.com
 [remote_ruby]: https://remoteruby.transistor.fm/
 [rorpodcast]: https://www.therubyonrailspodcast.com
 [rogues]: https://rubyrogues.com