Fix typo in comment

[nnegrey]

Fixes ##123 (it's a good idea to open an issue first for discussion)

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov-io]

Codecov Report

Merging #168 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #168   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines           5      5           
=====================================
  Hits            5      5

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