Update AsyncHTTPProvider docs

[kclowes]

What was wrong?

The AsyncHTTPProvider docs were unclear and causing confusion.

Closes #2121

How was it fixed?

Added the modules and middlewares args

Todo:

• Add entry to the release notes

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[fselmo]

LGTM!

[helgridly]

typo:

modules={'eth', (AsyncEth,), 'net': (AsyncNet,)},

should be

modules={'eth': (AsyncEth,), 'net': (AsyncNet,)},

i.e. colon instead of comma between eth and AsyncEth

[kclowes]

oops, thanks @helgridly! Feel free to submit a PR if you have time, otherwise I'll fix it soon!

[ak8g18]

Hey, I wanted to know what other modules we can use for AsyncHTTPProvider. I want to use the async library to make smart contract calls i.e web3.contract.functions... . I tried passing in: modules = modules={'eth', (AsyncEth,), 'contract': (AsyncContract,)}, but this hasn't worked. Kindly help with this

[jdbertron]

I have the exact same same issue as @ak8g18 above.

[kclowes]

Async Contract should be working as of v6b3, so make sure you're using that version or higher. If you're still having trouble, it's best to open a new issue rather than commenting on old, closed ones.