readme: remove build status badge

travis can't handle an android project this "big" so just stop using it for now and look for alternatives.
it's not that we have tests or codestyles to check...

README.md

@@ -1,5 +1,4 @@
 # Clover - 4chan browser for Android  
-[![build status](https://travis-ci.org/Floens/Clover.svg?branch=dev)](https://travis-ci.org/Floens/Clover)
 [![slack](https://slack.plebco.de/badge.svg)](https://slack.plebco.de/)
 [![irc](https://img.shields.io/badge/freenode-%23Clover-blue.svg)](https://webchat.freenode.net/?url=irc:///#Clover)