A test dependency for Travis

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index d87d465..613baf7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 language: go
 
+install: 
+    - go get github.com/stretchr/testify/assert
 go:
   - 1.0
   - 1.1