Gem staleness indication

Now that MRuby has been around for a number of years it's a bit tricky to sort through gems to know what's possibly up-to-date and what's likely abandoned and no longer compatible. Is there any interest in adding a bit of metadata to mgems.yml to make it easier to highlight what's likely maintained and what's likely not?

https://fundamental-code.com/mruby-timeline/ is something I put together with a bit of git log parsing. There are plenty of short lived gems from 2016 and earlier which I'd wager likely have some compatibility issues with how MRuby has evolved over the years.

审查现有的 mgems.yml 元数据和链接的 mruby 时间线，包括其中对 git-log 的解析，以了解有哪些可用的陈旧性信号。与维护者一起确定元数据和展示要求；当提案就识别并突出显示可能正在维护或已被弃用的 gem 达成一致范围时，即视为完成。