0.23.0
#98 Raise PHP version (#99) * #98 Raise php version * #98 Add native types * #98 Drop redundand type information from doc blocks * #98 Drop PHP 7.1, 7.2, 7.3 from travis configuration * #98 Add `ReturnTypeWillChange` attribute Add `ReturnTypeWillChange` attribute for methods with mixed return type to support PHP 8.1 type inheritance check.