Merge pull request flutter#802 from devoncarew/patch-1

Update README.md

Author: eseidelGoogle

README.md

@@ -1,5 +1,6 @@
 Sky
 ===
+[![Build Status](https://travis-ci.org/domokit/sky_engine.svg)](https://travis-ci.org/domokit/sky_engine)
 
 Sky is a new way to build high performance, cross platform mobile apps.
 More specifically, Sky is a rendering engine, a scripting engine, an