Add missing part for Timestamp request (#39)

Author: skotopes

flipper.proto

@@ -81,6 +81,8 @@ message Main {
         .PB_System.PowerInfoResponse system_power_info_response = 45;
         .PB_Storage.InfoRequest storage_info_request = 28;
         .PB_Storage.InfoResponse storage_info_response = 29;
+        .PB_Storage.TimestampRequest storage_timestamp_request = 59;
+        .PB_Storage.TimestampResponse storage_timestamp_response = 60;
         .PB_Storage.StatRequest storage_stat_request = 24;
         .PB_Storage.StatResponse storage_stat_response = 25;
         .PB_Storage.ListRequest storage_list_request = 7;