message: Unpin mistune
diff: @@ -11,6 +11,3 @@ furo
  # docutils 0.17.0 causes "AttributeError: module
  # 'docutils.nodes' has no attribute 'meta'" error when building doc
  docutils==0.18.*
  -# mistune 2.0.0-rc1 causes "AttributeError: module 'mistune'
  -# has no attribute 'BlockGrammar'" error when building doc
  -mistune<2.0.0
  \ No newline at end of file
  