Multple errors in PHP 7.4

[Rodrigo Arce]

You're using the static return type and union type both features are only valid in PHP 8.

Here're some of the errors I'm getting.

ParseError : syntax error, unexpected '|', expecting ';' or '{'
 /home/albo/projects/popo-factory/src/PopoFactory.php:110
 /home/albo/projects/popo-factory/tests/PopoFactoryTest.php:48 

ParseError : syntax error, unexpected 'static' (T_STATIC)
 /home/albo/projects/popo-factory/tests/Popos/PersonDataFactory.php:12
 /home/albo/projects/popo-factory/tests/PopoFactoryTest.php:63

[Craig Morris]

Only PHP8 is supported atm