Merge pull request #209 from zimmski/support-1.6-and-1.7

Always support the two latest Go releases
diff --git a/.travis.yml b/.travis.yml
index c47256e..e7c4be0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: go
 
 go:
-  - 1.6
+  - 1.6.x
+  - 1.7.x
 
 install:
   # go-flags