Update black config, update .flake8 config so we ignore rules which
conflict with black.
@@ -5,7 +5,11 @@ enable-extensions = L101,L102
# We ignore some rules which conflict with black
# E203 - whitespace before ':' - in direct conflict with black rule
# W503 line break before binary operator - in direct conflict with black rule
-ignore = E128,E402,E722,W504,E203,W503
+# E501 is line length limit
+# https://black.readthedocs.io/en/stable/the_black_code_style.html#line-length
+# We don't really need line length rule since black formatting takes care of
+# that.
+ignore = E128,E402,E722,W504,E501,E203,W503
exclude=*.egg/*,build,dist
# Configuration for flake8-copyright extension
