Fixes syntax error
Fixes syntax error

This will require a new release, was missing a comma
elucid/broccoli-asset-rev,joliss/broccoli-asset-rev,nadnoslen/broccoli-asset-rev,kevinlondon/broccoli-asset-rev,stefanpenner/broccoli-asset-rev,dollarshaveclub/broccoli-asset-rev,rickharrison/broccoli-asset-rev