Merge pull request #3 from kudmni/patch-1

Some one PHP8.3 deprecation found and fixed

Merge pull request #2 from kudmni/patch-1

Fix PHP 8.3 deprecations

- Remove PHP 7.0 and 7.1 from testing (incompatible)

Added unit testing for PHP 7.2

Updated README.md
Separated preg_replace code into an method

ValidateVersion() regression, simplified code

Added php nightly for testing (is allowed to fail)

Drop PHP 5.4 support + README

Added some links to relevant RFC-specifications

Match not found test

Removed the 2nd parameter, $fallback, from the match method