Upgrade to rustls 0.20.2

[mfelsche]

Are there any plans on upgrading to rustls 0.20.2? There seem to be some breaking changes, anything that is known to be a problem?

I could lend a hand, but would need to know how to verify that everything works as expected, should a simple cargo test --all encompass all the necessary checks?

[silverjam]

@mfelsche attempted a port here: https://github.com/async-rs/async-tls/pull/47 -- not everything compiles and the tests don't pass... but a start I suppose

[mfelsche]

Thank you so much @silverjam gonna have a look!

[Congyuwang]

https://github.com/quininer/futures-rustls This repo is a new folk from tokio/tls, which has integrated several bug fixes/updates since the rustls v0.20 update.

[dignifiedquire]

Fixed in 0.12.0