it is a test repo to test, learn, check something only
- travis-ci.org
- scrutinizer-ci.com
- lgtm.com
- packagist.org
- shields.io
- houndci.com
- danger.systems
- appveyor.com
- circleci.com
- jshint.com
https://www.sitepoint.com/php-continuous-integration-travis-ci/
https://www.sitepoint.com/inspecting-php-code-quality-scrutinizer/
