Broken link in Contributing.md file

[CarreraPHP]

The link for google's javascript guide line is broken in Coding Rules Block.

url: http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml

[valorkin]

Nice reason for small PR

[CarreraPHP]

@valorkin , Thanks for the encouragement. pull request #3171 has been submitted for the same.

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