Remove flask_discord.models.Application as its not provided under OAuth2

flask_discord/models/__init__.py

@@ -1,12 +1,11 @@
 from .connections import UserConnection
 from .integration import Integration
-from .user import User, Application
 from .guild import Guild
+from .user import User
 
 
 __all__ = [
     "Guild",
     "User",
-    "Application",
     "UserConnection",
 ]

flask_discord/models/user.py

@@ -219,8 +219,3 @@ class User(DiscordModelsBase):
         """
         self.connections = UserConnection.fetch_from_api(cache=False)
         return self.connections
-
-
-class Application(User):
-    """Class representing the client user itself."""
-    # TODO: What is this?