[travis-ci] Workaround composer cache invalidation
[travis-ci] Workaround composer cache invalidation

see: https://github.com/travis-ci/travis-ci/issues/2435

MadCat34/zend-paginator,Maks3w/zend-paginator,Maks3w/zend-paginator,zendframework/zend-paginator,MadCat34/zend-paginator,zendframework/zend-paginator