delevering can be transition from unpaid to delivering

lib/shotengai/order.rb

@@ -57,7 +57,7 @@ module Shotengai
       end
 
       event :send_out, after: :set_delivery_time do 
-        transitions from: :paid, to: :delivering 
+        transitions from: [:unpaid, :paid], to: :delivering 
       end
       
       event :confirm, after: :set_receipt_time do