update readme

README.md

@@ -23,6 +23,8 @@ Then on IRC
 * Replace device1 with device2-5 for additional devices
 * Replace token with your push token from Settings in Igloo
 
+EACH TIME YOU UNINSTALL/INSTALL OR SWITCH BETWEEN APP STORE AND TESTFLIGHT BUILDS YOU WILL GET A NEW PUSH TOKEN AND HAVE TO SET THIS AGAIN
+
 ## Testing
 
 `/msg *push send test`