Added ReactCasts (EbookFoundation#2178)

Author: cassiozen

free-podcasts-screencasts-en.md

@@ -219,6 +219,7 @@
 
 ### React JS
 
+* [Screencast] - [ReactCasts](https://www.youtube.com/c/reactcasts)
 * [Podcast] - [React Native Podcast](https://devchat.tv/react-native-radio)
 * [Podcast] - [React Podcast](http://reactpodcast.com)