CI - reset composer.json changes before docker build
CI - reset composer.json changes before docker build

https://docs.travis-ci.com/user/deployment/#uploading-files-and-skip_cleanup
Don't use composer.json from php 7.0 build ("composer install" installed optional tools)
https://travis-ci.org/EdgedesignCZ/phpqa/jobs/558470713#L1928
EdgedesignCZ/phpqa,EdgedesignCZ/phpqa