add build status to readme

tcrouch · tcrouch · commit 7de6bc87dfcd · 2016-11-15T18:30:34.000Z
diff --git a/README.md b/README.md
@@ -2,6 +2,7 @@
 
 A multiset (bag) implementation in Crystal.
 
+[![Build Status](https://travis-ci.org/tcrouch/multiset.cr.svg)](https://travis-ci.org/tcrouch/multiset.cr)
 [![docrystal.org](http://docrystal.org/badge.svg)](http://docrystal.org/github.com/tcrouch/multiset.cr)
 
 ## Installation
