Added some brazilian podcasts (EbookFoundation#2163)

* Added some brazilian podcasts

* Fixing alphabetical order

* Fixing alphabetical order (again)

* Adding blank line between sections

Fixing errors caught by Travis CI build

free-podcasts-screencasts-pt_BR.md

@@ -1,10 +1,17 @@
 ### Index
 
+* [Databases](#databases)
 * [Language Agnostic](#language-agnostic)
 
 
+### Databases
+
+* [Podcast] - [DatabaseCast](http://databasecast.com.br)
+
+
 ### Language Agnostic
 
 * [Podcast] - [DevNaEstrada](http://devnaestrada.com.br)
-* [Podcast] - [hipsters.tech](http://hipsters.tech)
+* [Podcast] - [Grok Podcast](http://www.grokpodcast.com)
+* [Podcast] - [Hipsters Ponto Tech](http://hipsters.tech)
 * [Podcast] - [PODebug](http://www.podebug.com)