Add support for premium app integrations

Co-authored-by: Danny <1695103+Rapptz@users.noreply.github.com>
Co-authored-by: Lucas Hardt <lucas.hardt@fu-berlin.de>
Co-authored-by: Andrin S. <65789180+Puncher1@users.noreply.github.com>

discord/__init__.py

@@ -41,6 +41,7 @@ from .integrations import *
 from .invite import *
 from .template import *
 from .welcome_screen import *
+from .sku import *
 from .widget import *
 from .object import *
 from .reaction import *