Added JavaScript podcast (#3822)

* Added JavaScript podcast

* Removed trailing forward slash from URL

free-podcasts-screencasts-en.md

@@ -142,6 +142,7 @@
 * [JavaScript Air](https://javascriptair.com) (podcast)
 * [JavaScript Jabber](https://devchat.tv/js-jabber) (podcast)
 * [Node Tuts - Node.JS Video Tutorials](http://nodetuts.com) (screencast)
+* [Real Talk JavaScript](https://realtalkjavascript.simplecast.com) (podcast)
 * [Syntax](https://syntax.fm) (podcast)
 * [The Javascript Show](http://javascriptshow.com) (podcast)