fix comment typo+grammar

[dvtate]

A small, inconsequential improvement I found while reading the source code.

[blakeembrey]

LGTM, the comments should also be mirrored in the README. Would you be able to update the README in this PR too?

[dvtate]

Good catch! Just fixed it there too.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4898ba2) to head (ff89327).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #235   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          160       159    -1     
  Branches        69        69           
=========================================
- Hits           160       159    -1     

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