Removed bugs from package.json schemata.

Several pull requests have been failing the build due to a difference in formatting `bugs`. This had it validating as a string however npm docs show it to be an array (https://www.npmjs.org/doc/files/package.json.html#bugs). As `bugs` wasn't required and I couldn't see cdnjs using it anywhere I thought this would help ease some of the builds failing just because of it.