Alter protocol extension

PROTOCOL.md

@@ -110,23 +110,23 @@ Example response:
     listings: {
       "tech": {
           name: "Tech Communities",
-          communities: 5
+          rooms: 5
       },
       "privsec": {
           name: "Privacy & Security",
-          communities: 4
+          rooms: 4
       },
       "casual": {
           name: "Casual Communities",
-          communities: 3
+          rooms: 3
       },
       "nsfw": {
           name: "18+ Communities",
-          communities: 3
+          rooms: 3
       }
       "all": {
           name: "All Communities",
-          communities: 10
+          rooms: 10
       }
     }
 }