Add Cocoaheads podcast pt-BR (#2226)

* Add cocoa heads pt-BR podcast

* Update link anchor

free-podcasts-screencasts-pt_BR.md

 ### Index
 
 * [Databases](#databases)
+* [iOS](#ios)
 * [Language Agnostic](#language-agnostic)
 
 
@@ -9,6 +10,10 @@
 * [Podcast] - [DatabaseCast](http://databasecast.com.br)
 
 
+### iOS
+* [Podcast] - [CocoaHeads](http://www.cocoaheads.com.br/podcasts)
+
+
 ### Language Agnostic
 
 * [Podcast] - [DevNaEstrada](http://devnaestrada.com.br)