Remove composer self-update

Author: snapshotpl

.travis.yml

@@ -11,7 +11,6 @@ env:
 
 before_script:
   - phpenv config-rm xdebug.ini
-  - composer self-update
   - if [[ $DEPS == 'lowest' ]]; then composer update --prefer-stable --no-interaction --prefer-lowest ; fi
   - if [[ $DEPS == 'latest' ]]; then composer update --prefer-stable --no-interaction ; fi