Consider deprecating this in favor of `futures-rustls`

This library seems to be a `tokio-tls` fork which hasn't been updated for a long while.

In the meantime, `tokio-tls` was split into `tokio-native-tls`, maintained by the tokio project, and `tokio-rustls`, which is maintained by the rustls team. `tokio-rustls` was then soft forked into `futures-rustls`, which in my opinion supersedes this library.

I'd argue this library should be deprecated and users of it should migrate to `futures-rustls`.

Review the issue's references to tokio-tls, tokio-native-tls, tokio-rustls, and futures-rustls, then inspect the repository's current maintenance and compatibility status. Done means reaching a maintainer decision on deprecation and documenting the migration or follow-up scope; no files or tests are named in the issue.

Written by the indexing model from the issue text.