Update the linting and formatting settings.

.vscode/settings.json

@@ -1,13 +1,14 @@
 {
-    "python.formatting.provider": "black",
-    "python.linting.enabled": true,
-    "python.linting.flake8Enabled": true,
-    "python.linting.flake8Args": [
-        "--max-line-length=88"
-    ],
+    "[python]": {
+        "editor.defaultFormatter": "ms-python.black-formatter",
+        "editor.formatOnSave": true
+    },
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
     "python.testing.pytestArgs": [
         "tests"
     ],
-    "python.testing.unittestEnabled": false,
-    "python.testing.pytestEnabled": true,
+    "flake8.args": [
+        "--max-line-length=120"
+    ]
 }

CONTRIBUTING.md

@@ -6,7 +6,16 @@ To try this out locally:
 - `source .venv/bin/activate` to use that virtual environment.
 - `poetry install` to install project dependencies.
 
-VSCode is recommended for development. You can try [these instructions](https://www.pythoncheatsheet.org/blog/python-projects-with-poetry-and-vscode-part-1) 
+VSCode is recommended for development.
+- For formatting, the project uses the [Black](https://github.com/psf/black) code formatter, and the
+[Black Formatter VSCode extension](https://marketplace.visualstudio.com/items?itemName=ms-python.black-formatter)
+is recommended.
+- For linting, the project uses the [Flake8](https://flake8.pycqa.org/en/latest/) linter and the
+[Flake8 extension](https://marketplace.visualstudio.com/items?itemName=ms-python.flake8) is recommended.
+These tools are included in the project by pyproject.toml and the settings are in .vscode/settings.json.
+
+You can also get additional information at
+[these instructions](https://www.pythoncheatsheet.org/blog/python-projects-with-poetry-and-vscode-part-1) 
 for getting setup in VSCode with linting and formatting enabled.
 
 ## Running the tests