add 1.5 to travis

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 159b9e6..79780ec 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: go
 go:
   - 1.4
-  
+  - 1.5
+
 install:
   - go get -v ./...
   - go get github.com/onsi/ginkgo