fix: add a missing in the JSON settings

Author: haideralsh

README.md

@@ -46,7 +46,7 @@ You should also specify settings that will be shared across all the plugin rules
     "propWrapperFunctions": [
         // The names of any function used to wrap propTypes, e.g. `forbidExtraProps`. If this isn't set, any propTypes wrapped in a function will be skipped.
         "forbidExtraProps",
-        {"property": "freeze", "object": "Object"}
+        {"property": "freeze", "object": "Object"},
         {"property": "myFavoriteWrapper"}
     ]
   }