docs: keep track of an issue I wrote that this pin avoids

nedbat · nedbat · commit 9c40c3e838cb · 2023-02-14T08:08:52.000-05:00
diff --git a/requirements/pins.pip b/requirements/pins.pip
@@ -10,4 +10,5 @@
 # Setuptools became stricter about version number syntax. But it shouldn't be
 # checking the Python version like that, should it?
 # https://github.com/pypa/packaging/issues/678
+# https://github.com/nedbat/coveragepy/issues/1556
 setuptools<66.0.0
