Version 0.7.4 : Php 8 & 8.1 support + bug fixes

What's Changed

• update exif tags for contentindentifier by @icager in #34
• Fix 1117 by @kamil4 in #36
• Don't accept 0000:00:00 00:00:00 as a valid date by @kamil4 in #38
• Support single values for keywords by @kamil4 in #39
• Support for Php8 & 8.1, drop 7.4 by @nagmat84 and @ildyria in #40

Full Changelog: v0.7.3...v0.7.4