Add master to run diff for lint

Author: lauriejim

.travis.yml

@@ -13,6 +13,7 @@ before_install:
   - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
+  - git fetch -a
   # - sudo chown -R $(whoami) $(npm config get prefix)/{lib/node_modules,bin,share}
   # - npm cache clean --force
   # - rm -rf node_modules/