Add missing 'params' property to 'parse'.

parse/parse.d.ts

@@ -890,6 +890,10 @@ declare namespace Parse {
              *The method of the request (i.e GET, POST, etc).
              */
             method?: string;
+            /**
+             * The query portion of the url.
+             */
+            params?: any;
             /**
              * The url to send the request to.
              */