Refactor nitpick to creates_nitpick

Naming's hard.

`Nitpick` feels more like a noun to me than a verb, but it's intended as a verb. That makes the code difficult to read, as it feels like a thing is wrapping a thing, whereas actually an action is creating a thing.

I've renamed it to be a verb as per Corey Haines' style (I'd appreciate @coreyhaines thoughts on this actually as I have no idea what I'm doing :smile:).

What do we think? Btw - I'm thinking of this as a WIP PR rather than the real thing, although happy for you to merge it if you like it.

I attach a poodle and a horse because animals make stressful things like naming feel happier. :poodle: :horse_racing: