Update `grunt` in the `peerDependencies`
Update `grunt` in the `peerDependencies`

https://github.com/gruntjs/grunt/blob/master/CHANGELOG
 - if you have a Grunt plugin that includes `grunt` in the `peerDependencies`, we recommend tagging with `"grunt": "">= 0.4.0"` and publishing a new version on npm.
mikaelkaron/grunt-util-options