Merge pull request #8518 from dvrkps/patch-1

travis: add 1.9.x instead of 1.9 to go version

.travis.yml

@@ -4,7 +4,7 @@ go_import_path: github.com/coreos/etcd
 sudo: false
 
 go:
-  - 1.9
+  - 1.9.x
   - tip
 
 notifications: