build(deps-dev): update docutils requirement from <0.19,>=0.15 to >=0.15,<0.21

[dependabot[bot]]

Updates the requirements on docutils to permit the latest version.

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[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d16ca82) 91.48% compared to head (bc999cf) 91.48%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2015   +/-   ##
=======================================
  Coverage   91.48%   91.48%           
=======================================
  Files           7        7           
  Lines         693      693           
=======================================
  Hits          634      634           
  Misses         59       59           

Flag	Coverage Δ
pytests	91.48% <ø> (ø)

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