Merge pull request 'fix: add missing import' (#11) from dev into master

Reviewed-on: https://chacha.ddns.net/gitea/chacha/pygamecfg/pulls/11
new-tag:0.4.1

src/pygamecfg/__init__.py

@@ -40,5 +40,6 @@ except PackageNotFoundError:  # pragma: no cover
 from .core_gamecfg import GameOptions_Factory
 from . import game_cod4
 from . import game_cod4_gungame
+from . import game_cod4_promod
 from . import game_ut99
 from . import game_ut2k4