Merge pull request #281 from Masterminds/feat/travis-go-1.6

Add support for Go 1.6 and Go Dev to Travis

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 0a42c0e..f54bf18 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,8 @@
 # against tip which has the features.
 go:
   - 1.5
+  - 1.6
+  - tip
 
 # Setting sudo access to false will let Travis CI use containers rather than
 # VMs to run the tests. For more details see: