2.2.1

• Enhancement: Synchronize with ergebnis/php-library-template (#306), by @localheinz
• Build(deps-dev): Bump phpstan/phpstan-deprecation-rules from 0.12.0 to 0.12.1 (#307), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan-strict-rules from 0.12.0 to 0.12.1 (#308), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan-phpunit from 0.12.3 to 0.12.5 (#305), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.3 to 0.12.4 (#309), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpunit/phpunit from 7.5.18 to 7.5.19 (#310), by @dependabot-preview[bot]
• Enhancement: Synchronize with ergebnis/php-library-template (#311), by @localheinz
• Build(deps-dev): Bump vimeo/psalm from 3.8.1 to 3.8.2 (#312), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpunit/phpunit from 7.5.19 to 7.5.20 (#314), by @dependabot-preview[bot]
• Enhancement: Synchronize with ergebnis/php-library-template (#315), by @localheinz
• Enhancement: Remove dependency on ergebnis/composer-json-normalizer (#316), by @localheinz