Fix java serialization

src/main/resources/application.conf

@@ -8,6 +8,8 @@ akka {
       plugin = "cassandra-journal"
     }
   }
+
+  actor.allow-java-serialization = on
 }
 
 cassandra-journal {

src/main/scala/eu/xeppaka/bot/CzechPostDeliveryCheck.scala

@@ -106,9 +106,13 @@ object CzechPostDeliveryCheck {
   private case class ParcelHistoryRetrieved(parcelHistory: Entities.ParcelHistory) extends Command
   case class DeliveryStateChanged(state: String)
 
+  @SerialVersionUID(1L)
   case class ParcelAdded(parcelId: String, comment: String) extends Event
+  @SerialVersionUID(1L)
   case class ParcelRemoved(parcelId: String) extends Event
+  @SerialVersionUID(1L)
   case class ParcelHistoryStateAdded(parcelId: String, state: Entities.State) extends Event
+  @SerialVersionUID(1L)
   case class ParcelAttributesChanged(parcelId: String, attributes: Entities.Attributes) extends Event
 
   private val trustfulSslContext: SSLContext = {