Implement robotk review command

[paroxp]

What

We'd like to receive some data from an API regarding a game we're currently talking about in the chat. Robotk could provide us with that information if we ask nicely.

nock is a testing library to mock any http request. AFAIK it doesn't make the request, but it captures any directed at this direction, then composes own response later on.

How to review

• Code review
• Run tests
• Attempt to ask robotk to obtain review of a game - You'll need to provide IGDB_API_KEY env var
• Decide whether the message format provided is sufficient

Closes #7

[michaelstephens]

Looks like CI is red

[paroxp]

CI is red for no reason. Could you restart the build?