support for async

[andrew-ld]

we are in 2020, the network is used asynchronously now

[UmanShahzad]

Hey @andrew-ld , that's right, though the network has been used asynchronously for as long as it's been around! The Python ecosystem is catching up.

I'll look into adding an async version of the handler soon, while keeping the synchronous versions around for users without coroutines support in their version of Python, and for backwards compatibility. This might require a separate package to do right, though, or simply drop support in newer package versions for the synchronous stuff.

[andrew-ld]

good!

[UmanShahzad]

@andrew-ld check out v4.0.0 - it has async support. Let me know if there are any issues with it.