Add links to OS documentation, attempt 3

[Thomasdezeeuw]

Replaces #248.

This increases MSRV to 1.54 (released nearly a year ago).

[Darksonn]

I notice that you have an open tracking issue for a breaking release. Is the MSRV bump happening as part of a breaking release?

[carllerche]

Socket2 bumping MSRV as an 0.x.0 release would be fine for us downstream (Tokio), but Tokio needs at a minimum 1.49.0 for socket2 0.4.x

[Thomasdezeeuw]

I notice that you have an open tracking issue for a breaking release. Is the MSRV bump happening as part of a breaking release?

It's a year old so I figure it's ok, but we can bump to 0.5.x.

Socket2 bumping MSRV as an 0.x.0 release would be fine for us downstream (Tokio), but Tokio needs at a minimum 1.49.0 for socket2 0.4.x

I though Tokio supported 6 months of Rust versions. Is this for a LTS release?

[carllerche]

@Thomasdezeeuw yes, but we also don't break MSRV in patch releases. If socket2 breaks MSRV in a patch it will break at the very least our LTS which is pinned.

[Thomasdezeeuw]

I'll start the v0.5.x version and update rustc to 1.62 (has creation of unix::SocketAddr) or something.

[Thomasdezeeuw]

Created #320 for v0.5, I've updated the MSRV to 1.62, aiming to support 1.63 (for I/O safety).