Set up DoctestFormatter

[angelikatyborska]

I wrote another formatting plugin 😁 I don't feel that this one is very much needed since we barely have any doctests, so feel free to reject this. I wrote the plugin just for fun based on a suggestion from a friend.

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[angelikatyborska]

Back to draft because I discovered implementation problems with my lib.

Edit: fixed in 0.2.0

[angelikatyborska]

Is this conference-driven development? :p

Haha, in a way 😂 I wrote the initial formatter because I wanted to have it for this repo. After I gave a lightning talk about it, a person from the audience asked if they can format doctests with it, so I also wrote a doctest formatter.