package.json: Add license property
package.json: Add license property

Using SPDX format:

https://docs.npmjs.com/files/package.json#license
http://npm1k.org/
dag10/node-lame,EQ4/node-lame,dag10/node-lame,TooTallNate/node-lame,mcanthony/node-lame,EQ4/node-lame,mcanthony/node-lame,TooTallNate/node-lame,dag10/node-lame,EQ4/node-lame,PlayNetwork/node-lame,TooTallNate/node-lame,PlayNetwork/node-lame,PlayNetwork/node-lame,mcanthony/node-lame