2.13.0

Small fixups all around, mostly code size improvements. In case your application depends specifically on webpki-roots certs being used, but still uses the https-rustls-probe feature, I'm afraid you'll have to stay on 2.12. I hope this isn't the case for anyone.

Also: periodic MSRV CI did its job! It took me 5 days to notice the notification, but still a big improvement in issue-appearance-to-fix-latency.

Changed

• The https-rustls-probe feature no longer brings in the webpki-roots and rustls-webpki crates. Thanks for the report, @polarathene! (#111)

Fixed

• Cleaned up an unnecessary format!() in Connection::connect. Thanks for the PR, @melotic! (#112)
• Fixed some msrv and lint issues introduced by libc and clippy updates respectively.