PHP-DI 6.1 supports PHP 7.2 and up. PHP 7.0 and 7.1 are no longer supported.

This release also includes:

• Add autowiring-support for PHP 7.4 typed properties #708 by @bzikarsky
• Make injectOn use the definition cache #709 by @bzikarsky
• PHP 7.4 is now fully supported and tested #699 by @jdreesen