Try pinning docutils to see if it fixes new build failure which just
started happening today.
@@ -170,6 +170,8 @@ deps = pyopenssl==19.1.0
fasteners
rstcheck
requests_mock
+ # Pinned due to a bug in a newer version
+ docutils<=0.16
changedir = docs
commands = pip install sphinx==3.3.1
rstcheck --report warning ../README.rst
