Bump version to 1.2.0
Bump version to 1.2.0

Features:
* PHP 8.1 Enum support (@agoalofalife)

Bug fixes:
* Correctly handle 'Custom' objects with subsequent values (@scagood)
* Only try to detect classes in string object keys (@scagood)
* Restore ES5 compatibility

bd808/php-unserialize-js,bd808/php-unserialize-js