Removed deprecated packaged (gulp-util) and introduced alternative pa…

index.js

@@ -1,5 +1,4 @@
-var gutil = require('gulp-util');
-var PluginError = gutil.PluginError;
+var PluginError = require('plugin-error');;
 var through2 = require('through2');
 var uglifycss = require('uglifycss');
 

package.json

@@ -25,9 +25,10 @@
   },
   "homepage": "https://github.com/ubirak/gulp-uglifycss",
   "dependencies": {
-    "gulp-util": "^3.0.8",
+    "plugin-error": "^1.0.1",
     "through2": "^2.0.3",
-    "uglifycss": "^0.0.25"
+    "uglifycss": "^0.0.25",
+    "vinyl": "^2.1.0"
   },
   "devDependencies": {
     "mocha": "^3.2.0",

test/main.js

@@ -1,14 +1,14 @@
 var uglifycss = require('../');
 var should = require('should');
-var gutil = require('gulp-util');
+var Vinyl = require('vinyl');
 var fs = require('fs');
 var pj = require('path').join;
 
 function createVinyl(filename, contents) {
     var base = pj(__dirname, 'fixtures');
     var filePath = pj(base, filename);
 
-    return new gutil.File({
+    return new Vinyl({
         cwd: __dirname,
         base: base,
         path: filePath,