Which for PHP 12.0.0

• Breaking change: raised the required PHP version.
• Breaking change: removed the ResultSet->stream() method.
• Breaking change: renamed the root namespace to Belin\Which.
• Breaking change: the ResultSet methods are now implemented as properties.
• Breaking change: using PHP 8.5 features, like the pipe operator.
• The ResultSet class now implements IteratorAggregate interface.
• Removed the command line interface.
• Updated the package dependencies.