2.3.0

• Enhancement: Extract environment variable (#365), by @localheinz
• Fix: Update composer/composer as used for composer-normalize.phar (#366), by @localheinz
• Build(deps-dev): Bump ergebnis/php-cs-fixer-config from 2.0.0 to 2.1.0 (#367), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.11 to 0.12.12 (#368), by @dependabot-preview[bot]
• Build(deps-dev): Bump symfony/filesystem from 4.4.4 to 4.4.5 (#369), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.12 to 0.12.13 (#370), by @dependabot-preview[bot]
• Build(deps-dev): Bump phpstan/phpstan from 0.12.13 to 0.12.14 (#371), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.9.3 to 3.9.4 (#372), by @dependabot-preview[bot]
• Build(deps-dev): Bump vimeo/psalm from 3.9.4 to 3.9.5 (#373), by @dependabot-preview[bot]
• Enhancement: Require composer/composer:^1.10.0 (#375), by @localheinz
• Enhancement: Update schema.json (#374), by @ergebnis-bot