Add more rsvp command aliases

[munyari]

This builds off the tireless work of @jjst by adding new command aliases
for rsvp yes:

• :+1: is the short form of :thumbs_up: (because who has time to
  write :thumbs_up:?)
• y is just short for yes (because who has time to write yes?)
• n is just short for no (because who has time to write no?)

This PR also addresses #65

[wtfcarlos]

Hi @munyari . Thanks for your contribution!

Cna you make sure all tests pass? Thanks!

[munyari]

LOL oops!! This is where I confess I don't have all the build stuff setup yet because I'm having pip issues. Looks like a regex escaping thing though, maybe just fixing that will do it

[munyari]

Yeah, that fixed it. I'll get all my stuff properly set up next time 😄

[jjst]

Awesome. Was not aware that :+1: was a thing! Should we support :-1: as well then? (looks like it's a valid alias)

[munyari]

I don't think Zulip has :-1: funnily enough... At least it doesn't pop up automatically

[jjst]

Ah! I tested in a PM and it works, but doesn't autocomplete. Weird! Maybe a bug in Zulip?

[jjst]

Now to be fair, replying with "rsvp 👎" seems a little bit negative and I don't think anyone ever used it 😛

[munyari]

Gotta love zulip! I agree though, a thumbs down may be too negative. On the other hand, if we already support :thumbs_down:, then it makes sense to support :-1: too

[wtfcarlos]

@munyari @jjst Negative or not, we need symmetry in the implementation.

[munyari]

👍 it'll get done @kokeshii