Gulp-util deprecation

[dorothyDorothy]

Gulp-util is deprecated. Please see advice here: https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5

• gutil.File => https://www.npmjs.com/package/vinyl
• gutil.replaceExtension => The .extname property on Vinyl objects or https://www.npmjs.com/package/replace-ext *gutil.colors => https://www.npmjs.com/package/ansi-colors
• gutil.date => https://www.npmjs.com/package/date-format
• gutil.log => https://www.npmjs.com/package/fancy-log
• gutil.template => https://www.npmjs.com/package/lodash.template
• gutil.env => https://www.npmjs.com/package/minimist
• gutil.beep => https://www.npmjs.com/package/beeper
• gutil.noop => https://www.npmjs.com/package/through2
• gutil.isStream => Use the .isStream() method on Vinyl objects
• gutil.isBuffer => Use the .isBuffer() method on Vinyl objects
• gutil.isNull => Use the .isNull() method on Vinyl objects
• gutil.linefeed => Use the string '\n' in your code
• gutil.combine => https://www.npmjs.com/package/multipipe
• gutil.buffer => https://www.npmjs.com/package/list-stream
• gutil.PluginError => https://www.npmjs.com/package/plugin-error

[demurgos]

Duplicate of #36

[hustxiaoc]

fixed https://github.com/hustxiaoc/gulp-minify/pull/34