Add send_rate_avoid param

Author: romkatsu

src/main/php/Gomoob/Pushwoosh/Model/Notification/Notification.php

@@ -237,14 +237,14 @@ class Notification implements \JsonSerializable
      * @var int
      */
     private $sendRate;
-    
+
     /**
      * If set to true, throttling limit will not be applied to this specific push notification
      *
      * @var bool
      */
     private $sendRateAvoid;
-
+    
     /**
      * The timezone to use with the `sendDate` property, if ignored UTC-0 is default in "send_date".
      * See http://php.net/manual/timezones.php for the list of the supported timezones.