pin mistune, dep of m2r, after breaking change release
@@ -152,6 +152,7 @@ deps =
sphinx==3.5.4
sphinx_rtd_theme==0.5.0
recommonmark==0.6.0
+ mistune<2.0.0
m2r==0.2.1
commands =
{envbindir}/python {toxinidir}/../../../eng/tox/prep_sphinx_env.py -d {distdir} -t {toxinidir}
