test coverage dropped for higher php versions

https://github.com/TehJoE/Codeception/commit/03fa0be62f0655e85b176ef81da27b3bc78b5e35 https://stackoverflow.com/questions/38776212/does-codeception-have-an-equivalent-to-phpunits-strict-coverage https://barryvanveen.nl/blog/45-improve-the-accuracy-of-your-tests-with-atcovers-and-atcoversnothing-annotations https://stackoverflow.com/questions/48221975/phpunit-coverage-does-not-cover-static-method https://github.com/sebastianbergmann/php-code-coverage/issues/683 https://github.com/sebastianbergmann/phpunit/issues/3794