Wrong license in package.json

[Juanjo Diaz]

The license in package.json seems to be ISC

rollup-plugin-node-builtins/package.json

Line 20 in 63ab8aa

 "license": "ISC", 

However, the readme states that the license is MIT.
https://github.com/calvinmetcalf/rollup-plugin-node-builtins/blob/master/readme.md#license

This might break tools used to check licenses, create bills of materials and stuff like that.