Change: Set minimum PHP version to 7.3
This version updates the minimum PHP version requirement to 7.3.
Please note that 7.3 was always required, I just failed to realise this when updating the Twitter posting API code.
The next version number bump will likely be 7.4, as the update that enables PHP 8.1 support will also drop support for 7.3. It is always recommended you keep your PHP installation up to date.