Enforce some pydocstyle lints with flake8-docstrings

There are some ones we *would* like to enforce, like
    D401 First line should be in imperative mood
but have too many false positives, so I left them out.

Author: bluetech

.pre-commit-config.yaml

@@ -25,7 +25,9 @@ repos:
     hooks:
     -   id: flake8
         language_version: python3
-        additional_dependencies: [flake8-typing-imports==1.9.0]
+        additional_dependencies:
+          - flake8-typing-imports==1.9.0
+          - flake8-docstrings==1.5.0
 -   repo: https://github.com/asottile/reorder_python_imports
     rev: v2.3.0
     hooks:

tox.ini

@@ -154,6 +154,7 @@ commands = python scripts/publish-gh-release-notes.py {posargs}
 
 [flake8]
 max-line-length = 120
+select = E,F,W,C,TYP,D200,D201,D206,D207,D208,D210,D211,D212,D214,D215,D300,D301,D403,D404
 extend-ignore = E203
 
 [isort]