This is a maintenance release. With this release, PHPMailer gains official PHP 8 compatibility; earlier versions worked in PHP 8 pre-releases, but the test suite did not. The considerable rework this required (which also restored tests running on older PHP versions) was done by @jrfnl – thank you very much!

• PHP 8.0 compatibility
• Switch from PHP CS Fixer to PHP CodeSniffer for coding standards
• Create class constants for the debug levels in the POP3 class
• Improve French, Slovenian, and Ukrainian translations
• Improve file upload examples so file extensions are retained
• Resolve PHP 8 line break issues due to a very old PHP bug being fixed
• Avoid warnings when using old openssl functions
• Improve Travis-CI build configuration