document two choices on tls via rustls

Signed-off-by: clux <[email protected]>

Author: clux

docs/features.md

@@ -13,6 +13,7 @@ All public features are exposed through `kube` in [kube's Cargo.toml](https://gi
 | derive      | [CustomResource]                   | no      | [kube-derive], [syn], [quote]|
 | openssl-tls | tls via openssl                    | no      | [openssl], [hyper-openssl]   |
 | rustls-tls  | tls via rustls                     | [yes]   | [rustls], [hyper-rustls]     |
+| ring        | rustls via ring                    | yes     | [ring]                       |
 | aws-lc-rs   | rustls via aws-lc-rs               | no      | [aws-lc-rs]                  |
 | ws          | [Execute], [Attach], [Portforward] | no      | [tokio-tungstenite]          |
 | gzip        | gzip compressed transport          | no      | [tower-http] feature         |

includes/links.md

@@ -118,6 +118,7 @@
 [rustls]: https://crates.io/crates/rustls
 [hyper-rustls]: https://crates.io/crates/hyper-rustls
 [aws-lc-rs]: https://crates.io/crates/aws-lc-rs
+[ring]: https://crates.io/crates/ring
 [tokio-tungstenite]: https://crates.io/crates/tokio-tungstenite
 [tame-oauth]: https://crates.io/crates/tame-oauth
 [hyper-socks2]: https://crates.io/crates/hyper-socks2