Summarize kube::Error changes

[kazk]

Motivation

Make the changelog less overwhelming for average users (#709 (comment))

Solution

Summarized the changes to kube::Error and moved the original in <details>.

[clux]

ah, nice use of a collapsible comment :-)

[clux]

Sounds like we are good for a minor release. Want me to do one?

[clux]

(Waiting for rustls also seems sensible here, but no problem to do another minor.)

[kazk]

Yeah, I think we can cut a new release. I can remove Error::RustlsTls from the changelog later.

• Added Error::RustlsTls(kube::client::RustlsTlsError) (errors from rustls-tls feature) - Update rustls to 0.20.1 #704

[clux]

I can remove that one line before release. Need to commit to master anyway.

[clux]

Ok, all done. 0.64.0 is out.
f9bfe11 is the removed line.

Thanks again for all the great error work this release!