Update pushbullet.py

fix pushbullet notif errors/stop working
source : http://www.nicholasoverstreet.com/2014/07/fix-sickbeard-pushbullet-notification-failed-error/

sickbeard/notifiers/pushbullet.py

@@ -56,7 +56,7 @@ class PushbulletNotifier:
             pushbullet_device = sickbeard.PUSHBULLET_DEVICE
 
         if method == 'POST':
-            uri = '/api/pushes'
+            uri = '/v2/pushes'
         else:
             uri = '/api/devices'