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Update CONTRIBUTION.md with pre-commit + black-primer instructions (#1459)

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* Update CONTRIBUTION with pre-commit + black-primer instructions
- Inform people how to run primer and alter it's config
- Link to main documentation

* Apply suggestions from code review

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
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CONTRIBUTING.md
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@ -24,7 +24,7 @@ You can use any operating system. I am using macOS myself and CentOS at work.
Install all development dependencies using:
```
```console
$ pipenv install --dev
$ pipenv shell
$ pre-commit install
@ -34,12 +34,26 @@ If you haven't used `pipenv` before but are comfortable with virtualenvs, just r
`pip install pipenv` in the virtualenv you're already using and invoke the command above
from the cloned _Black_ repo. It will do the correct thing.
Before submitting pull requests, run tests with:
Before submitting pull requests, run lints and tests with:
```
```console
$ pre-commit run -a
$ python -m unittest
$ black-primer [-k -w /tmp/black_test_repos]
```
## black-primer
`black-primer` is used by CI to pull down well-known _Black_ formatted projects and see
if we get soure code changes. It will error on formatting changes or errors. Please run
before pushing your PR to see if you get the actions you would expect from _Black_ with
your PR. You may need to change
[primer.json](https://github.com/psf/black/blob/master/src/black_primer/primer.json)
configuration for it to pass.
For more `black-primer` information visit the
[documentation](https://github.com/psf/black/blob/master/docs/black_primer.md).
## Hygiene
If you're fixing a bug, add a test. Run it first to confirm it fails, then fix the bug,