Avoid branch builds on PRs

With the merge build is enough. Only master branch is to be tested.

Author: yajo

.travis.yml

@@ -19,6 +19,10 @@ addons:
     packages:
       - docker-ce
 
+branches:
+  only:
+    - master
+
 env:
   matrix:
     - DOCKER_TAG=9.6-alpine