message: Update .travis.yml
  git fetch origin master:master instead of creating new master branch
diff: @@ -28,8 +28,7 @@ cache:
  before_install:
  - sh scripts/restore-original-timestamps.sh
  - - git fetch origin master
  - - git branch master -f
  + - git fetch origin master:master
  before_deploy:
  - git config --global user.email ${GITHUB_EMAIL}
  