Made typo correction on NPM installation command.

[mikebronner]

Sorry for the tiny PR, but thought it would help, as this line is always copied over when installing.

[codecov]

Codecov Report

Merging #6 (09800b5) into master (83e8649) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #6   +/-   ##
=========================================
  Coverage     37.92%   37.92%           
  Complexity       52       52           
=========================================
  Files             9        9           
  Lines           327      327           
  Branches         14       14           
=========================================
  Hits            124      124           
  Misses          195      195           
  Partials          8        8           

Flag	Coverage Δ	Complexity Δ
jest	54.47% <ø> (ø)	0.00 <ø> (ø)
pest	27.94% <ø> (ø)	0.00 <ø> (ø)

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[georgeboot]

Thanks!