permit "rfcbot resolve foo" as an alias

[nikomatsakis]

I confess, I can never remember the syntax around concerns. I would appreciate a few aliases. Here are some things I commonly try:

• @rfcbot resolve foo
• @rfcbot fcp resolve foo

Alternatively, a message from the bot when it sees a command it does not understand would be nice. Something like:

---

Dear @nikomatsakis,

I am but a simple bot and I am afraid I do not understand what you want of me. Perhaps you could try one of the following commands?

• rfcbot fcp merge
• rfcbot concern foo
• rfcbot resolve foo
• ...

---

Actually, I just want both. =)

[anp]

The first thing you listed should already work, but I haven't tested it: https://github.com/anp/rfcbot-rs/blob/master/src/github/nag.rs#L810 (I left that TODO in there because I couldn't remember what "correct tokenization" meant and it looks like that code should work).

I definitely agree that this would be really valuable to have.

[Centril]

This is implemented now, so let's close this issue?