Update license attribute
Update license attribute

specifying the type and URL is deprecated:

https://docs.npmjs.com/files/package.json#license
http://npm1k.org/
ahumphreys87/iBars,pedroha/hogan.js,paulwib/hogan.js,twitter/hogan.js,kavallo/hogan.js,bariders/hogan.js,twitter/hogan.js,ahumphreys87/iBars,bariders/hogan.js,pedroha/hogan.js,paulwib/hogan.js,kavallo/hogan.js