Removed dependancy on gulp-util

[adriennn]

as per https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5

[carstenschaefer]

thanks for this!

[razvanphp]

@carstenschaefer can you please publish this version to npm? package.json needs also to be updated.

This currently fails npm audit checks:

# npm audit report

lodash.template  *
Severity: high
Command Injection in lodash - https://github.com/advisories/GHSA-35jh-r3h4-6jhm
No fix available
node_modules/lodash.template
  gulp-util  >=1.1.0
  Depends on vulnerable versions of lodash.template
  node_modules/gulp-util
    gulp-delete-lines  *
    Depends on vulnerable versions of gulp-util
    node_modules/gulp-delete-lines

3 high severity vulnerabilities

Some issues need review, and may require choosing
a different dependency.

Thank you!