Add Ruby Conferences

[MikeRogers0]

Mentioned in: https://github.com/MikeRogers0/Ruby-Meetup-Calendar/pull/31

https://rubyconferences.org/ has a really good list of all the conferences which are happening.

It'll be really cool to pull that data in & display it also.

[meg-gutshall]

Here's a Twitter list of conferences that I've been (sorta) curating but not all of them are Ruby: https://twitter.com/i/lists/1184584389633679361/members. Here's another list of conferences I maintain that's in a Google Sheet: https://tinyurl.com/free-online-confs. Take note of the "upcoming" and "past" tabs at the bottom. You can probably keyword search the page and pick some out of here.