Problematic docs for black use

[HectorMenezes]

While following the documentation's quickstart in a project, I encountered the following error after running pre-commit with the .pre-commit-config.yaml provided there:

(precommit) ➜  precommit git:(main) ✗ pre-commit run --all-files
Check Yaml...............................................................Passed
Fix End of Files.........................................................Passed
Trim Trailing Whitespace.................................................Passed
black....................................................................Failed
- hook id: black
- exit code: 123

error: cannot format src/main.py: Cannot parse: 2:16: if amazing_var := amazing_bool is None:
All done! 💥 💔 💥
1 file failed to reformat.

At first, I thought it was a problem with black, and it had been in fact, but it was fixed. I easily fixed by changing

repos:
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.3.0
    hooks:
    -   id: check-yaml
    -   id: end-of-file-fixer
    -   id: trailing-whitespace
-   repo: https://github.com/psf/black
    rev: 19.3b0
    hooks:
    -   id: black

to

repos:
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.3.0
    hooks:
    -   id: check-yaml
    -   id: end-of-file-fixer
    -   id: trailing-whitespace
-   repo: https://github.com/psf/black
    rev: stable
    hooks:
    -   id: black

It'd be a good idea to change that.

[asottile]

feel free to send a PR though your suggested configuration is not correct

you might also be interested in pre-commit autoupdate