update black, cleanup static check rules

Signed-off-by: Aleksei Stepanov <penguinolog@gmail.com>

pyproject.toml

@@ -11,7 +11,7 @@ build-backend="setuptools.build_meta"
 [tool.black]
 line-length = 120
 safe = true
-py36 = true
+target-version = ["py36", "py37", "py38"]
 
 [tool.isort]
 line_length = 120

setup.cfg

@@ -40,9 +40,17 @@ exclude =
     docs
 ignore =
     E203,
-    W503
 # whitespace before ':'
+    W503,
 # line break before binary operator
+    D401,
+# First line should be in imperative mood; try rephrasing
+    D202,
+# No blank lines allowed after function docstring
+    D203,
+# 1 blank line required before class docstring
+    D213
+# Multi-line docstring summary should start at the second line
 show-pep8 = True
 show-source = True
 count = True
@@ -51,16 +59,13 @@ max-line-length = 120
 [pydocstyle]
 ignore =
     D401,
-    D202,
-    D203,
-    D213
 # First line should be in imperative mood; try rephrasing
+    D202,
 # No blank lines allowed after function docstring
+    D203,
 # 1 blank line required before class docstring
+    D213
 # Multi-line docstring summary should start at the second line
 
 [aliases]
 test=pytest
-
-[tool:pytest]
-addopts = -vvv -s -p no:django -p no:ipdb

tox.ini

@@ -75,47 +75,6 @@ deps =
     -r{toxinidir}/CI_REQUIREMENTS.txt
 commands = pylint exec_helpers
 
-[flake8]
-exclude =
-    .venv,
-    .git,
-    .tox,
-    dist,
-    doc,
-    *lib/python*,
-    *egg,
-    build,
-    __init__.py,
-    docs
-ignore =
-    E203,
-# whitespace before ':'
-    W503,
-# line break before binary operator
-    D401,
-# First line should be in imperative mood; try rephrasing
-    D202,
-# No blank lines allowed after function docstring
-    D203,
-# 1 blank line required before class docstring
-    D213
-# Multi-line docstring summary should start at the second line
-show-pep8 = True
-show-source = True
-count = True
-max-line-length = 120
-
-[pydocstyle]
-ignore =
-    D401,
-# First line should be in imperative mood; try rephrasing
-    D202,
-# No blank lines allowed after function docstring
-    D203,
-# 1 blank line required before class docstring
-    D213
-# Multi-line docstring summary should start at the second line
-
 [testenv:docs]
 deps =
     sphinx