Is this the 404 error that is supposed to show with OctoKit?

API rate limit exceeded for deohtee.
See: https://developer.github.com/v3/#rate-limiting

Want to double check before submitting a PR.

@deohtee Yes, this is the kind of error that we would like to talk about in this part of the README. There may be other outputs, but this communicative error message (including that link about Rate Limiting, suuuuper) guides the user to the right solution quicker.

To be clear, this section is now inaccurate:

So, if you got an error like this:

! /Library/Ruby/Gems/2.0.0/gems/github_api-0.12.2/lib/github_api/response/raise_error.rb:14:in `on_complete'

Related to #482