Update the integration file location and naming

docs/fastapi.md

@@ -30,7 +30,7 @@ FastAPI 异常处理程序会自动对其进行处理。您可以通过为 `OAut
 ```python
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
-from fastapi_oauth20.integrations.fastapi import OAuth20AuthorizeCallbackError
+from fastapi_oauth20.callback import OAuth20AuthorizeCallbackError
 
 app = FastAPI()
 

fastapi_oauth20/__init__.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+from .callback import FastAPIOAuth20 as FastAPIOAuth20
+from .callback import OAuth20AuthorizeCallbackError as OAuth20AuthorizeCallbackError
 from .clients.feishu import FeiShuOAuth20 as FeiShuOAuth20
 from .clients.gitee import GiteeOAuth20 as GiteeOAuth20
 from .clients.github import GitHubOAuth20 as GitHubOAuth20
 from .clients.google import GoogleOAuth20 as GoogleOAuth20
 from .clients.linuxdo import LinuxDoOAuth20 as LinuxDoOAuth20
 from .clients.oschina import OSChinaOAuth20 as OSChinaOAuth20
-from .integrations.fastapi import FastAPIOAuth20 as FastAPIOAuth20
-from .integrations.fastapi import OAuth20AuthorizeCallbackError as OAuth20AuthorizeCallbackError
 
 __version__ = '0.0.1'