Add missing colon for customPages (#6393)

Author: JeromeDeLeon

README.md

@@ -338,7 +338,7 @@ It’s possible to change the default pages of the app and redirect the user to
 var server = ParseServer({
   ...otherOptions,
 
-  customPages {
+  customPages: {
     passwordResetSuccess: "http://yourapp.com/passwordResetSuccess",
     verifyEmailSuccess: "http://yourapp.com/verifyEmailSuccess",
     parseFrameURL: "http://yourapp.com/parseFrameURL",