- Make it compatible with jcupitt/vips 2.1 (and disable support for 2.0, 1.0.x is still supported). See libvips/php-vips#147 for details.
- Add more phpstan tests for all the combinations
- Replace vips_version with Jcupitt\Vips\Config::version() for better support, when vips-ext is not available
- Add some simple PHPUnit tests