Changed usage text

[dpaz]

#55

[codecov]

Codecov Report

Merging #56 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #56   +/-   ##
=======================================
  Coverage   84.78%   84.78%           
=======================================
  Files          16       16           
  Lines         940      940           
=======================================
  Hits          797      797           
  Misses         84       84           
  Partials       59       59

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