Explain the effect of Access-Control-Allow-Origin: '*'

[jackrk]

This is useful information regardless, but when #70 is addressed we should replace '*' references in this section with a placeholder like my-domain.com

[codecov-io]

Codecov Report

Merging #300 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   87.32%   87.32%           
=======================================
  Files          19       19           
  Lines        1814     1814           
  Branches      211      211           
=======================================
  Hits         1584     1584           
  Misses        178      178           
  Partials       52       52

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[stealthycoin]

#311