feat: clean up environment call outs

Author: stainless-app[bot]

README.md

@@ -83,17 +83,14 @@ pip install --pre replicate[aiohttp]
 Then you can enable it by instantiating the client with `http_client=DefaultAioHttpClient()`:
 
 ```python
-import os
 import asyncio
 from replicate import DefaultAioHttpClient
 from replicate import AsyncReplicate
 
 
 async def main() -> None:
     async with AsyncReplicate(
-        bearer_token=os.environ.get(
-            "REPLICATE_API_TOKEN"
-        ),  # This is the default and can be omitted
+        bearer_token="My Bearer Token",
         http_client=DefaultAioHttpClient(),
     ) as replicate:
         prediction = await replicate.predictions.get(