add missing vendor module requirement

[jsirish]

No description provided.

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage     86.27%   86.27%           
  Complexity        9        9           
=========================================
  Files             1        1           
  Lines            51       51           
=========================================
  Hits             44       44           
  Misses            7        7

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