Add Travis-CI badge (#20)

Frank Cash · scottnonnenberg · commit 70eb5c54941f · 2017-11-06T12:01:50.000-08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,8 @@
 # libsignal-protocol-javascript
 
+[![Build Status](https://travis-ci.org/WhisperSystems/libsignal-protocol-javascript.svg?branch=master)](https://travis-ci.org/WhisperSystems/libsignal-protocol-javascript)
+
+
 Signal Protocol implementation for the browser based on
 [libsignal-protocol-java](https://github.com/WhisperSystems/libsignal-protocol-java).
 
