Broken link to 'input.club'

The link *[`https://input.club/kll/`](https://input.club/kll/)* in file '*[README.md](https://github.com/kiibohd/kll-spec/blob/0.5/README.md)*' appears to be (effectively) broken:

>  Bad gateway \
> Error code 502 \
> Visit [cloudflare.com](https://www.cloudflare.com/5xx-error-landing?utm_source=errorcode_502&utm_campaign=input.club) for more information. \
> 2024-11-30 11:27:24 UTC
