Update README.md

[princemaple]

Mainly just want to add the missing )

[codecov-io]

Codecov Report

Merging #17 (e8c9b2d) into master (97df944) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   83.67%   83.67%           
=======================================
  Files           2        2           
  Lines          98       98           
=======================================
  Hits           82       82           
  Misses          8        8           
  Partials        8        8           

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