Breaking: implement asyncio support.

[asaf-kali]

POC for this issue.
Usage:

@retry()
async def make_trouble():
    # Some flaky code
    pass

async def some_function():
    await make_trouble()

[tl24]

It's possible to conditionally await by calling inspect.isawaitable. Not sure if you can keep the signature without the await, or do an equivalent of an await call using some library function:

  is_async = False
  value = f()
  if inspect.isawaitable(value):
     is_async = True
     value = await value
  return value

is_async could potentially be used in the except block to determine which sleep method to use

[laur89]

I couldn't find a way to keep the signature intact. And also went with inspect module to find out whether it's dealing with an async function: my implementation