only async request and file writes

[avaldebe]

• close use async request library #10
• focused version of async request and file writes #11
• update docs config
• update RTD config

[JohnPaton]

I really like this approach! I tried it out a bit and it also seems like a significant speedup, nice work! Just a few questions and kinks to iron out.

Form the other PR, could you still add the documentation update too? 🙏

Thanks for slimming this down, it made it a lot more manageable to review. Do feel free to open issues/PRs addressing the other contributions from #11, I'm happy for the help, it was just too broad for a single PR.

[JohnPaton]

@avaldebe if this is ready for a re-review just request it or let me know 😊

[avaldebe]

It is ready for re-review.
If I went too far with the docs setup, I can move it to a separate PR.

[JohnPaton]

This looks awesome! Thanks for contributing 🍰 ✨

I'm also going to switch the CI/CD over from Travis to GitHub actions right after this, then I'll do a new release.

[JohnPaton]

I put a little acknowledgement to you in the README :)