2.1.0

• Fix: Reference (#53), by @localheinz
• Fix: Remove useless test (#54), by @localheinz
• Build(deps-dev): Bump phpstan/phpstan from 0.12.5 to 0.12.6 (#55), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.6 to 0.12.7 (#56), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan-strict-rules from 0.12.1 to 0.12.2 (#57), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.7 to 0.12.8 (#58), by @dependabot-preview[bot]
• Build(deps-dev): Bump ergebnis/phpstan-rules from 0.14.2 to 0.14.3 (#59), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.8 to 0.12.9 (#60), by @dependabot-preview[bot]
• Build(deps-dev): Bump jangregor/phpstan-prophecy from 0.6.0 to 0.6.1 (#61), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.8.3 to 3.8.4 (#62), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.8.4 to 3.8.5 (#63), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.9 to 0.12.10 (#64), by @dependabot-preview[bot]
• Build(deps-dev): Bump psalm/plugin-phpunit from 0.8.1 to 0.9.0 (#65), by @dependabot-preview[bot]
• Build(deps-dev): Bump ergebnis/composer-normalize from 2.2.2 to 2.2.3 (#66), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.8.5 to 3.9.0 (#68), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.10 to 0.12.11 (#67), by @dependabot-preview[bot]
• Build(deps-dev): Bump jangregor/phpstan-prophecy from 0.6.1 to 0.6.2 (#69), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.9.0 to 3.9.2 (#70), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.9.2 to 3.9.3 (#71), by @dependabot-preview[bot]
• Build(deps-dev): Bump ergebnis/composer-normalize from 2.2.3 to 2.2.4 (#72), by @dependabot-preview[bot]
• Enhancement: Configure php_unit_dedicate_assert fixer to target newest versions (#73), by @localheinz