Docstrfmt

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**Changed**

- Open files with ``UTF-8`` encoding.

**Fixed**

- Fix encoding/decoding errors when opening files on Windows.

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- First official docstrfmt release!

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- Forked from `dzhu/rstfmt <https://github.com/dzhu/rstfmt>`_
- Renamed to docstrfmt
- Added ability to format Python docstrings
- Switched to click for argument parsing
- Formatted code with black
- Made code easier to read
- Added more rst constructs
- Added more tests