Add license attribute
Add license attribute

https://docs.npmjs.com/files/package.json#license
http://npm1k.org/
buunguyen/stripe-node,matthewarkin/stripe-node,fingerfoodstudios/fusebill-node,stripe/stripe-node,stripe/stripe-node,bradcavanagh-ffs/fusebill-node,bendiy/stripe-node,DanielAudino/fusebill-node,tempbottle/stripe-node,toymachiner62/stripe-node