feat: add ability to format in place

[josegonzalez]

It would be great to have an in-place formatter, such that we don't need to write the content back out to another file (temporary or not).

[aluttik]

After this change you should be able to write back to the input file using --out, so you can do in-place formatting.

Ex.

crossplane format nginx.conf -o nginx.conf

[aluttik]

This changes has been included in crossplane 0.5.2 which is now available on PyPI 👍

[josegonzalez]

Thank you!