add async context manager methods

mystbin/client.py

@@ -23,7 +23,8 @@
 from __future__ import annotations
 
 import datetime
-from typing import List, Literal, Optional, Sequence, Union, overload
+from types import TracebackType
+from typing import List, Literal, Optional, Sequence, Type, Union, overload
 
 import aiohttp
 
@@ -41,6 +42,17 @@ class Client:
     def __init__(self, *, token: Optional[str] = None, session: Optional[aiohttp.ClientSession] = None) -> None:
         self.http: HTTPClient = HTTPClient(token=token, session=session)
 
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(
+        self,
+        exc_cls: Optional[Type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType]
+    ):
+        await self.close()
+
     async def close(self) -> None:
         """|coro|