Fix parcel example

[rrousselGit]

Parcel example on the newer versions shows a 404 error on npm start.

Changing the start scripts to parcel index.html fixes the issue

[codecov-io]

Codecov Report

Merging #1035 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1035   +/-   ##
=======================================
  Coverage   86.71%   86.71%           
=======================================
  Files          31       31           
  Lines         828      828           
  Branches      191      191           
=======================================
  Hits          718      718           
  Misses         91       91           
  Partials       19       19

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[theKashey]

So easy :)