Drop vendor prefix for @custom-media

Author: MoOx

index.js

@@ -389,14 +389,13 @@ module.exports = function(css, options){
 
   function atcustommedia() {
     var pos = position();
-    var m = match(/^@([-\w]+)?custom-media (--[^\s]+) *([^{]+);/);
+    var m = match(/^@custom-media (--[^\s]+) *([^{]+);/);
     if (!m) return;
 
     return pos({
       type: 'custom-media',
-      vendor: trim(m[1]),
-      name: trim(m[2]),
-      media: trim(m[3])
+      name: trim(m[1]),
+      media: trim(m[2])
     });
   }
 

test/cases/custom-media.json

@@ -4,7 +4,6 @@
     "rules": [
       {
         "type": "custom-media",
-        "vendor": "",
         "name": "--narrow-window",
         "media": "(max-width: 30em)",
         "position": {