Remove `Qafoo/QualityAnalyzer`

The project is not maintained.

README.md

 * [Phpactor](https://github.com/phpactor/phpactor) - PHP completion, refactoring and introspection tool.
 * [PHPLOC](https://github.com/sebastianbergmann/phploc) - A tool for quickly measuring the size of a PHP project.
 * [PHPQA](https://github.com/EdgedesignCZ/phpqa) - A tool for running QA tools (phploc, phpcpd, phpcs, pdepend, phpmd, phpmetrics).
-* [Qafoo Quality Analyzer](https://github.com/Qafoo/QualityAnalyzer) - A tool to visualize metrics and source code.
 * [Rector](https://github.com/rectorphp/rector) - A tool to upgrade and refactor code.
 * [Scrutinizer](https://scrutinizer-ci.com/) - A web tool to [scrutinise PHP code](https://github.com/scrutinizer-ci/php-analyzer).
 * [UBench](https://github.com/devster/ubench) - A simple micro-benchmark library.