Update .travis.yml

Author: cyilin

.travis.yml

@@ -18,7 +18,7 @@ before_deploy:
 - git config credential.helper "store --file=.git/credentials"
 - echo "https://$GITHUB_KEY:@github.com" > .git/credentials
 - git status
-- git push -q --follow-tags
+- git push origin HEAD:$TRAVIS_BRANCH -q --follow-tags
 - gem install octokit -v 4.3.0
 deploy:
   skip_cleanup: true