• IMPORTANT: PHP 8.1 or greater is now required.
• BREAKING: Read-only properties are now used for the model and record
  classes rather than magic methods. This significantly improves performance.
• BREAKING: The raw property on model classess and the record property on
  record classes have been removed.
• BREAKING: On GeoIp2\Record\Traits, the deprecated isAnonymousProxy and
  isSatelliteProvider properties have been removed.
• BREAKING: The jsonSerialize output has changed.
• GeoIp2\WebService\Client methods now throw an InvalidArgumentException
  if an invalid IP address is passed to them. Previously, they would make
  a request to the web service and throw a
  GeoIp2\Exception\InvalidRequestException.
• The isAnycast property was added to GeoIp2\Record\Traits. This returns
  true if the IP address belongs to an anycast
  network. This is available for the
  GeoIP2 Country, City Plus, and Insights web services and the GeoIP2 Country,
  City, and Enterprise databases.