workaround for travis bug on conditional releases

travis-ci/travis-ci#1675

Author: silvolu

.travis.yml

@@ -26,4 +26,5 @@ deploy:
   on:
     tags: true
     repo: GoogleCloudPlatform/gcloud-python
-    branch: master
+    # until this is fixed: https://github.com/travis-ci/travis-ci/issues/1675
+    all_branches: true