package.json: removed trailing comma
package.json: removed trailing comma

* Caused parsing errors

beagleboard/bonescript,jadonk/bonescript,mwillbanks/octalbonescript,risebox/bonescript,il9ue/bonesimulator,beagleboard/bonescript,jadonk/bonescript,il9ue/bonesimulator,risebox/bonescript,theoctal/octalbonescript