Update contributing wording (#2719)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>
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Felix Hildén 2021-12-21 20:43:10 +02:00 committed by GitHub
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@ -7,7 +7,8 @@ An overview on contributing to the _Black_ project.
Development on the latest version of Python is preferred. As of this writing it's 3.9.
You can use any operating system.
Install all development dependencies using:
Install development dependencies inside a virtual environment of your choice, for
example:
```console
$ python3 -m venv .venv