added set apns

lib/pigeon/fcm/notification.ex

@@ -46,9 +46,9 @@ defmodule Pigeon.FCM.Notification do
   FCM notification target. Must be one of the following:
 
   - `{:token, "string"}` - Registration token to send a message to.
-  - `{:topic, "string"}` - Topic name to send a message to, e.g. "weather". 
+  - `{:topic, "string"}` - Topic name to send a message to, e.g. "weather".
     Note: "/topics/" prefix should not be provided.
-  - `{:condition, "string"}` - Condition to send a message to, e.g. "'foo' 
+  - `{:condition, "string"}` - Condition to send a message to, e.g. "'foo'
     in topics && 'bar' in topics".
   """
   @type target :: {:token, binary} | {:topic, binary} | {:condition, binary}
@@ -100,6 +100,10 @@ defmodule Pigeon.FCM.Notification do
   end
 end
 
+def set_apns(%Pigeon.FCM.Notification{} = notification, apns) do
+  %{notification | apns: apns}
+end
+
 defimpl Pigeon.Encodable, for: Pigeon.FCM.Notification do
   def binary_payload(notif) do
     encode_requests(notif)