--- a/black.toml	Tue Oct 29 10:43:47 2019 +0100
+++ b/black.toml	Tue Oct 29 11:07:25 2019 +0100
@@ -11,7 +11,6 @@
 | mercurial/thirdparty/
 | hgext/fsmonitor/pywatchman/
 | contrib/python-zstandard/
-| contrib/grey.py
 '''
 skip-string-normalization = true
 quiet = true