Set up github token on travis

Author: torreytsui

.travis.yml

@@ -53,6 +53,7 @@ before_install:
   - phpenv config-rm xdebug.ini || true
   - composer self-update
   - if ! [ -z "$STABILITY" ]; then composer config minimum-stability ${STABILITY}; composer config prefer-stable true; fi;
+  - if [ "$GITHUB_TOKEN" != "" ]; then composer config github-oauth.github.com $GITHUB_TOKEN; fi
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require symfony/symfony:${SYMFONY_VERSION} --no-update; fi
   - export BRANCH=$(if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then echo $TRAVIS_BRANCH; else echo $TRAVIS_PULL_REQUEST_BRANCH; fi)