FEATURE: Provide source & issues url via composer.json

Closes #43

See merge request !42

FEATURE: Provide minimal required php version in composer.json

Closes #40

See merge request !43

Feature: Naming

See merge request !40

TASK: Migrate deprecated phpunit calls

See merge request !41

Use no short array syntax to work on lower php versions.
Also adjust another test case to work again.

Only this way it's possible to include the original standard in own
phpcs configuration.

Fix/php mess detector

See merge request !36

Implement PHPCodeSniffer Standards Finder Service

Closes #30

See merge request !32

Resolve "Implement PHP Mess Detector"

Closes #29

See merge request !35

See https://github.com/sebastianbergmann/phpunit/issues/1409