Added another note about (not running) init

EddyVerbruggen · EddyVerbruggen · commit 9418ecc35276 · 2018-10-12T09:33:25.000+02:00
diff --git a/docs/NON_FIREBASE_MESSAGING.md b/docs/NON_FIREBASE_MESSAGING.md
@@ -17,6 +17,8 @@ Two important things to keep in mind are:
 
 ## Setup
 
+> Do not run the plugin's `.init` function!
+
 ### Android
 No additional setup required.
 
