Change in documentation generator script due to new PIP version.

[avilchess]

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[codecov[bot]]

Codecov Report

Merging #70 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   98.57%   98.57%           
=======================================
  Files          12       12           
  Lines        1475     1475           
=======================================
  Hits         1454     1454           
  Misses         21       21

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