make acceptance packages buildable
diff --git a/.travis.yml b/.travis.yml
index d8ed19f..4b317c2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,7 @@
 - go get golang.org/x/crypto/ssh
 - go get -v -tags 'fixtures acceptance' ./...
 go:
-- 1.4
-- 1.5
+- 1.6
 - tip
 env:
   global: