Ensure Black version consistency

Author: bug-or-feature

.github/workflows/lint.yml

@@ -8,3 +8,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: psf/black@stable
+        with:
+          options: "--check"
+          version: "22.12.0"

CONTRIBUTING.md

@@ -42,8 +42,12 @@ black path/to/module.py
 Or, get your IDE or editor to automatically re-format files as you save. Configuration
 instructions [here](https://black.readthedocs.io/en/stable/integrations/editors.html)
 
-Note for pycharm users: The blackd plugin requires a blackd daemon to be running; add it to your crontab.
+> Note for pycharm users: The blackd plugin requires a blackd daemon to be running; add it to your crontab.
 
 Or, configure your local git install to automatically check and fix your code
 as you commit. Configuration instructions 
 [here](https://black.readthedocs.io/en/stable/integrations/source_version_control.html)
+
+### Black version
+
+Black needs to be consistent between the version running in the CI build and your local environment. To check the currently used version, see the [GitHub action config](https://github.com/robcarver17/pysystemtrade/blob/master/.github/workflows/lint.yml)

pyproject.toml

@@ -5,3 +5,4 @@ addopts = "--ignore=systems/provided/moretradingrules/temp.py"
 [tool.black]
 line-length = 88
 target-version = ['py38']
+required-version = '22.12.0'