Modify flake8 config to match black

Author: lossyrob

.flake8

@@ -1,14 +1,3 @@
 [flake8]
-max-line-length = 100
-
-## IGNORES
-
-# E126: yapf conflicts with "continuation line over-indented for hanging indent"
-
-# E127: flake8 reporting incorrect continuation line indent errors
-# on multi-line and multi-level indents
-
-# W503: flake8 reports this as incorrect, and scripts/format_code
-# changes code to it, so let format_code win.
-
-ignore = E126,E127,W503
+max-line-length = 88
+extend-ignore = E203, W503, E731, E722