Asyncio support in README

[Andrew-Chen-Wang]

Hi, we're trying to integrate with merge API. I don't see any asyncio support which is a problem for event loop based programs. I noticed some httpx usage with AsyncClient. Any guidance would be helpful or an update to the README :)

[dsinghvi]

Hey @Andrew-Chen-Wang -- We'll update the README to include some asyncio examples. Apologize for the inconvenience.