[MAINT] Update requirements.txt

[nbara]

No description provided.

[codecov]

Codecov Report

Merging #49 (dea88d4) into master (d0bd972) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   78.24%   78.24%           
=======================================
  Files          20       20           
  Lines        2211     2211           
=======================================
  Hits         1730     1730           
  Misses        481      481           

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