update dependency

[iliesaithamouda]

hi,
can you please update your package.json to remove gulp-utils ?
gulp-utils is deprecated.
i can see that it is used to log. here is an alternative to the plugin: https://github.com/js-cli/fancy-log

here's some usefuls links:
https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5

we're using gulp-slang in our project and i want to remove all warnings that i have in the log.

thank you

[iliesaithamouda]

i can see that there's already a pull request to fix this. so please proceed for a merge
#12