0.6.1

• Enhancement: Move indirect tests into separate namespace (#95), by @localheinz
• Update ergebnis/composer-normalize from 2.1.1 to 2.2.0 (#96), by @violinist-bot
• Enhancement: Enable strict_types fixer (#97), by @localheinz
• Update ergebnis/php-cs-fixer-config from 1.1.2 to 1.1.3 (#98), by @violinist-bot
• Enhancement: Add file-level header (#99), by @localheinz
• Update phpunit/phpunit from 7.5.18 to 7.5.19 (#101), by @violinist-bot
• Update phpunit/phpunit from 7.5.19 to 7.5.20 (#102), by @violinist-bot
• Update ergebnis/composer-normalize from 2.2.0 to 2.2.1 (#103), by @violinist-bot
• Fix: Remove parameters (#104), by @localheinz
• Update ergebnis/composer-normalize from 2.2.1 to 2.2.2 (#106), by @violinist-bot
• Update phpstan/phpstan from 0.12.4 to 0.12.6 (#105), by @violinist-bot
• Update phpspec/prophecy from 1.10.1 to v1.10.2 (#107), by @violinist-bot
• Update phpstan/phpstan from 0.12.6 to 0.12.7 (#108), by @violinist-bot
• Update phpstan/phpstan from 0.12.7 to 0.12.8 (#109), by @violinist-bot
• Update phpstan/phpstan from 0.12.8 to 0.12.9 (#110), by @violinist-bot
• Fix: Add missing test (#113), by @localheinz
• Enhancement: Update shivammathur/setup-php (#114), by @localheinz
• Enhancement: Extract environment variable (#115), by @localheinz
• Enhancement: Use ergebnis/license (#116), by @localheinz
• Fix: Do not import every single class (#117), by @localheinz
• Fix: Mark classes as final (#118), by @localheinz
• Fix: Method invocations on methods of ObjectProphecy might have side effects (#119), by @localheinz