allow rustls and disable native-tls?

[tgrushka]

Thanks for this crate. I'm trying to build for Docker and can't because it depends on native-tls. I don't want to go down that whole rabbit hole of installing openssl in cargo cross just for this. Any way to remove or make native-tls an optional feature? Or is it absolutely required? Thanks.

[hatoo]

Currently, native-tls is used in DefaultClient because some sites use old algorithms which aren't supported by rustls.

Yeah, I think it should be able to switch to rustls by feature flags.

[hatoo]

I've published v0.13.0 which you can remove native-tls by using --no-default-feature --features "rustls-client"