flake8 configuration

Author: azmeuk

docs/requirements.txt

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+Sphinx~=3.0.2
+Pallets-Sphinx-Themes~=1.2.3
+sphinx-issues~=1.2.0
+sphinxcontrib-log-cabinet~=1.0.1
+python-dateutil~=2.8.1

setup.cfg

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+[flake8]
+# B = bugbear
+# E = pycodestyle errors
+# F = flake8 pyflakes
+# W = pycodestyle warnings
+# B9 = bugbear opinions
+# ISC = implicit-str-concat
+select = B, E, F, W, B9, ISC
+ignore =
+    # slice notation whitespace, invalid
+    E203
+    # line length, handled by bugbear B950
+    E501
+    # bare except, handled by bugbear B001
+    E722
+    # bin op line break, invalid
+    W503
+# up to 88 allowed by bugbear B950
+max-line-length = 80
+per-file-ignores =
+    # __init__ modules export names
+    **/__init__.py: F401, F403