Add pre-commit config; update README

.pre-commit-config.yaml

@@ -0,0 +1,34 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.3.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: debug-statements
+    -   id: double-quote-string-fixer
+    -   id: requirements-txt-fixer
+-   repo: https://github.com/asottile/setup-cfg-fmt
+    rev: v2.0.0
+    hooks:
+    -   id: setup-cfg-fmt
+-   repo: https://github.com/asottile/add-trailing-comma
+    rev: v2.3.0
+    hooks:
+    -   id: add-trailing-comma
+        args: [--py36-plus]
+-   repo: https://github.com/asottile/pyupgrade
+    rev: v2.38.2
+    hooks:
+    -   id: pyupgrade
+        args: [--py37-plus]
+-   repo: https://github.com/pre-commit/mirrors-autopep8
+    rev: v1.7.0
+    hooks:
+    -   id: autopep8
+        args: [--in-place, --max-line-length=88]
+-   repo: https://github.com/PyCQA/flake8
+    rev: 5.0.4
+    hooks:
+    -   id: flake8
+        args: [--max-line-length=88]

README.md

@@ -97,17 +97,8 @@ class MyClass(
 ```
 You can opt out of class inheritence checks by ignoring rules `IND201` and `IND202`.
 
-## Rationale
-
-When we only indent by 4 spaces in function definitions, it is difficult to visually distinguish function arguments with the function name and the function body. This reduces readability.
-
-It is similar for base classes in class definitions, but it's less of an issue than function definitions.
+### _Notes_
 
-## Interaction with other style checkers and formatters
-
-* [`black`](https://github.com/psf/black)-formatted code will cause a style violation here, because `black` authors [explicitly opted for the 4-space indentation and do not plan to change it](https://github.com/psf/black/issues/1178#issuecomment-614050678)
-* The style enforced in this plugin contradicts with rule [WPS318](https://wemake-python-styleguide.readthedocs.io/en/latest/pages/usage/violations/consistency.html#wemake_python_styleguide.violations.consistency.ExtraIndentationViolation) enforced by [wemake-python-styleguide](https://github.com/wemake-services/wemake-python-styleguide) ("WPS")
-    - But WPS is configurable so you can always opt out of WPS318
 * This plugin does not check trailing commas, because [flake8-commas](https://github.com/PyCQA/flake8-commas) already does it
 * This plugin does not forbid grouping arguments (see example below), because [WPS317](https://wemake-python-styleguide.readthedocs.io/en/latest/pages/usage/violations/consistency.html#wemake_python_styleguide.violations.consistency.ParametersIndentationViolation) can enforce it
 ```python
@@ -117,3 +108,16 @@ def some_func(
 ):
     pass
 ```
+
+## Rationale
+
+When we only indent by 4 spaces in function definitions, it is difficult to visually distinguish function arguments with the function name and the function body. This reduces readability.
+
+It is similar for base classes in class definitions, but it's less of an issue than function definitions.
+
+## Interaction with other style checkers and formatters
+
+* By design, [`black`](https://github.com/psf/black)-formatted code will cause a style violation here, because `black` authors [explicitly opted for the 4-space indentation and do not plan to change it](https://github.com/psf/black/issues/1178#issuecomment-614050678)
+* The style enforced in this plugin contradicts with rule [WPS318](https://wemake-python-styleguide.readthedocs.io/en/latest/pages/usage/violations/consistency.html#wemake_python_styleguide.violations.consistency.ExtraIndentationViolation) enforced by [wemake-python-styleguide](https://github.com/wemake-services/wemake-python-styleguide) ("WPS")
+    - But WPS is configurable, so you can always opt out of WPS318
+* You can use [py-def-indent-formatter](https://github.com/cyyc1/py-def-indent-formatter) right after `black` to make your code satisfy the style requirements of this plugin

setup.cfg

@@ -5,8 +5,6 @@ description = A flake8 plugin that enforces 8-space indentation in function/clas
 long_description = file: README.md
 long_description_content_type = text/markdown
 url = https://github.com/cyyc1/flake8-indent-in-def
-author =
-author_email =
 license = MIT
 license_file = LICENSE
 classifiers =