added codepen link for first README example

[Domiii]

Having a codepen to play around with right away, without having to waste 1-10 minutes (depending on experience) can be a blessing!

[coveralls]

Coverage remained the same at 100.0% when pulling 0512243 on Domiii:patch-1 into 09b3c73 on reactjs:master.

[codecov-io]

Codecov Report

Merging #283 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #283   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          15     15           
=====================================
  Hits           15     15

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[ellbee]

Cool, thanks! Sorry it took so long for me to get around to looking at this.