kawa-3.1.1 released

[Lassi Kortela]

> I have submitted a PR to update Homebrew to include Kawa 3.1.1:
> 
> https://github.com/Homebrew/homebrew-core/pull/49108

Late to the party, but Docker is now at 3.1.1 as well:

$ docker run -it weinholt/kawa
Kawa 3.1.1 (git describe: 3.1.1-0-gc47de33ad)
...

$ docker run -it weinholt/kawa bash
root@17701d793a31:/# kawa --version
Kawa 3.1.1 (git describe: 3.1.1-0-gc47de33ad)
...