Merge pull request #45 from fitztrev/patch-1

Upgrade sabberworm/php-css-parser to latest v8.3.0

Author: PhenX

composer.json

@@ -21,7 +21,7 @@
     }
   },
   "require": {
-    "sabberworm/php-css-parser": "8.1.*"
+    "sabberworm/php-css-parser": "^8.3"
   },
   "require-dev": {
     "phpunit/phpunit": "^5.5|^6.5"