Merge pull request #44 from dvrkps/patch-1

travis: update go versions

.travis.yml

@@ -3,9 +3,11 @@ sudo: required
 dist: trusty
 
 go:
-  - 1.5.4
-  - 1.6.3
-  - 1.7
+  - 1.5.x
+  - 1.6.x
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
   - tip
 
 env: