remove gh token config call

Author: krakjoe

.travis.yml

@@ -25,7 +25,6 @@ env:
     - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-ansi --no-progress --no-suggest"
 
 before_install:
-  - composer config github-oauth.github.com ${GH_TOKEN}
   - composer self-update
   - composer clear-cache
   - export COMPOSER_ROOT_VERSION=6.1.99