feat: clean up environment call outs

Author: stainless-app[bot]

README.md

@@ -79,15 +79,14 @@ pip install openint[aiohttp]
 Then you can enable it by instantiating the client with `http_client=DefaultAioHttpClient()`:
 
 ```python
-import os
 import asyncio
 from openint import DefaultAioHttpClient
 from openint import AsyncOpenint
 
 
 async def main() -> None:
     async with AsyncOpenint(
-        token=os.environ.get("OPENINT_API_KEY"),  # This is the default and can be omitted
+        token="My Token",
         http_client=DefaultAioHttpClient(),
     ) as client:
         page = await client.list_connections()