removed deprecated gulp-util (#50)

Author: zbennett10

gulpfile.js

@@ -1,6 +1,6 @@
 var gulp = require('gulp');
 var mocha = require('gulp-mocha');
-var gutil = require('gulp-util');
+var log = require('fancy-log');
 var istanbul = require('gulp-istanbul');
 
 gulp.task('pre-test', function () {
@@ -16,5 +16,5 @@ gulp.task('test', ['pre-test'], function () {
     includeUntested: true,
     reporters: ['lcov']
   }))
-  .on('error', gutil.log);
+  .on('error', log);
 });

index.js

@@ -3,7 +3,7 @@
 const applySourceMap = require('vinyl-sourcemaps-apply');
 const CleanCSS = require('clean-css');
 const path = require('path');
-const PluginError = require('gulp-util').PluginError;
+const PluginError = require('plugin-error');
 const through = require('through2');
 
 module.exports = function gulpCleanCSS(options, callback) {