blacken-docs

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✨ New argument: --check

As the name indicates this will merely check if the code would have been re-written.

A further change is that the return value of blacken-docs is now the largest error for each file. Previously if file 2 failed with an error but file 1 would be re-written then the exit code would have been 1 as opposed to the more severe 2.

Closes #277

Sorry for the delay; was on holiday.

I also added the tests and the changelog.

From context I think that the changelog requires a version bump; I did so in the setup.cfg but do warn me if I've done it wrong.

Dear @adamchainz,

Anything else you'd like to see before merging?

Sorry to be a bother; but since it's been a while so I decided to ping