fix: Async example in generated README.md

Author: dbanty

openapi_python_client/templates/README.md.jinja

@@ -34,7 +34,7 @@ Or do the same thing with an async version:
 
 ```python
 from {{ package_name }}.models import MyDataModel
-from {{ package_name }}.async_api.my_tag import get_my_data_model
+from {{ package_name }}.api.my_tag import get_my_data_model
 from {{ package_name }}.types import Response
 
 my_data: MyDataModel = await get_my_data_model.asyncio(client=client)