Merge pull request #2 from webdevian/greenkeeper/gulp-autoprefixer-4.0.0

Update gulp-autoprefixer to the latest version 🚀

Author: webdevian

package.json

@@ -24,7 +24,7 @@
   "dependencies": {
     "foundation-sites": "^6.3.1",
     "gulp": "^3.9.0",
-    "gulp-autoprefixer": "^3.1.0",
+    "gulp-autoprefixer": "^4.0.0",
     "gulp-concat": "^2.6.1",
     "gulp-load-plugins": "^1.1.0",
     "gulp-pug": "^3.3.0",