license property in package.json

[abcirta]

Hello,

I've a teeny tiny request concerning the license of this project, more details below:

Is your feature request related to a problem? Please describe. webpack license plugin notifies an error regarding the absence of a license property in package.json

Describe the solution you'd like Add a License property in package.json, since this project is MIT, that should be "license": "MIT"

Thank you