Update README.md

Author: cbaker6

README.md

@@ -42,7 +42,8 @@ guard let parseServerUrl = URL(string: "http://localhost:1337/1") else {
 ParseSwift.initialize(applicationId: "applicationId", // Required: Change to your applicationId.
                       clientKey: "clientKey", // Required: Change to your clientKey.
                       masterKey: "masterKey", // Required: Change to your masterKey.
-                      serverURL: parseServerUrl) { _, completionHandler in
+                      serverURL: parseServerUrl,
+                      usingPostForQuery: true) { _, completionHandler in
     completionHandler(.performDefaultHandling, nil)
 }
 ```