Update quick_start.md

[azev77]

Typo missing ,

[codecov]

Codecov Report

Merging #149 (ca482dd) into master (b8c5c02) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #149   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          32       32           
  Lines        6183     6183           
=======================================
  Hits         6181     6181           
  Misses          2        2           

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[pulsipher]

Thank you for the correction.