update README

README.md

@@ -3,14 +3,16 @@ Songbook
 
 Songs data for LaTeX songbooks.
 
+[![Build Status](https://drone.xd0.de/api/badges/hendrik/songbook/status.svg)](https://drone.xd0.de/hendrik/songbook)
+
+## Patadata
+
 This data is meant to be processed by the songbook toolkit:
 - [command line client](https://github.com/patacrep/patacrep)
 - [gui client](https://github.com/patacrep/patagui) (not up-to-date with this data)
 - [web client](https://github.com/patacrep/patanet) work in progress.
 
-## Patadata
-
-[![documentation](http://readthedocs.org/projects/patacrep/badge)](http://patacrep.readthedocs.io)
+[Documentation](http://patacrep.readthedocs.io)
 
 ## Getting started