Update peerDependencies to support Grunt 1.0

[grunt-updater2]

Update peerDependencies to support Grunt 1.0

Hello,

This is an automated issue request to update the peerDependencies for your Grunt plugin. We ask you to merge this and publish a new release on npm to get your plugin working in Grunt 1.0!

Read more here: http://gruntjs.com/blog/2016-02-11-grunt-1.0.0-rc1-released#peer-dependencies Also on Twitter: https://twitter.com/gruntjs/status/700819604155707392

If you have any questions or you no longer have time to maintain this plugin, then please let us know in this thread.

Thanks for creating and working on this plugin!

(P.S. Close this PR if it is a mistake, sorry)