Replace wrong function in partition comment

[PatrickHaecker]

Base.count does something else.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.72%. Comparing base (9c88eb1) to head (c329f00).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #125   +/-   ##
=======================================
  Coverage   90.72%   90.72%           
=======================================
  Files           1        1           
  Lines         399      399           
=======================================
  Hits          362      362           
  Misses         37       37           

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