Remove ComposerRequireChecker

Author: ondrejmirtes

.travis.yml

@@ -12,6 +12,3 @@ before_script:
   - composer install
 script:
   - vendor/bin/phing
-  - >
-    wget https://github.com/maglnet/ComposerRequireChecker/releases/download/0.2.1/composer-require-checker.phar
-    && php composer-require-checker.phar check composer.json