Replaced deprecated gulp-util

[zbennett10]

This pr replaces the recently deprecated gulp-util package with corresponding dependencies and fixes #15

For more info see:

https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
gulpjs/gulp-util#143

Thanks!

[avdeev]

@morou Review, plz

[rejas]

If @morou doesnt want to maintain this library I'd be willing to take over maintainership if that is of any help.

[morou]

first, i'm sorry for may late reply. i'll merge this PR right now.

@rejas I appreciate your offer! can I transfer ownership of this repository to you?

[rejas]

@morou yes you can. probably also on npm so I can do a release too

[morou]

@rejas It would be helpful if you release!

I'll transfer ownership now, please confirm it.

[rejas]

@morou thx, could you also transfer it on npm to me? https://www.npmjs.com/~rejas
that way I can also release it into the npm jungle :-)

[avdeev]

Good news for this package :)