List library as deprecated and suggest alternative

[tebs1200]

It doesn't look like this library is being maintained. There's an alternative that is maintained (evgenyneu/keychain-swift) that has a similar API, so it should be trivial for users to move across.

Maybe put a notice in the readme linking people to the alternative library if this isn't going to be updated?

I can create a PR for this if you're interested.

[remypanicker]

Another alternative is https://github.com/kishikawakatsumi/KeychainAccess

[Prometheos2]

I can create a PR for this if you're interested.

I think it would be a good idea 👍
I plan on doing a PR or more to fix some issues (we never know), so I can take care of that if you want.

Edit: Nevermind, I might not have enough time to do a PR.