Change variable type for list of chats (#101)

ozon/chats.go

@@ -53,10 +53,10 @@ type ListChatsChat struct {
 	Chat ListChatsChatData `json:"chat"`
 
 	// Identifier of the first unread chat message
-	FirstUnreadMessageId string `json:"first_unread_message_id"`
+	FirstUnreadMessageId uint64 `json:"first_unread_message_id"`
 
 	// Identifier of the last message in the chat
-	LastMessageId string `json:"last_message_id"`
+	LastMessageId uint64 `json:"last_message_id"`
 
 	// Number of unread messages in the chat
 	UnreadCount int64 `json:"unread_count"`

ozon/chats_test.go

@@ -38,8 +38,8 @@ func TestListChats(t *testing.T) {
 					  "chat_status": "Opened",
 					  "chat_type": "Seller_Support"
 					},
-					"first_unread_message_id": "3000000000118021931",
-					"last_message_id": "30000000001280042740",
+					"first_unread_message_id": 3000000000118021931,
+					"last_message_id": 3000000000128004274,
 					"unread_count": 1
 				  }
 				],