make test output verbose on travis

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 2fb68ca..4fbf875 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,5 +2,5 @@
 go:

   - tip

 script:

-  - go test ./...

+  - go test -v ./...

   - go build