added config options to readme

Author: mhydock

README.md

@@ -350,7 +350,9 @@ default, you must create it manually.
         "enabled": true,
         "dragThreshold": 50,
         "mediaUpdateInterval": 500,
-        "showOnHover": true
+        "showOnHover": true,
+        "enableMedia": true,
+        "enablePerformance": true
     },
     "launcher": {
         "actionPrefix": ">",