Configure isort to have the same line length as flake8

pgjones · pgjones · commit 1126f5353007 · 2020-12-24T19:34:52.000Z
This allows isort and black to play nicely for a long import line in
the typing module.
diff --git a/setup.cfg b/setup.cfg
@@ -47,3 +47,6 @@ testpaths = tests
 exclude = venv/*,tox/*,specs/*
 ignore = E123,E128,E266,E402,W503,E731,W601
 max-line-length = 119
+
+[isort]
+line_length = 119
