message: Fix bug in GET_TAA state proof validation
diff: @@ -216,7 +216,7 @@ pub fn parse_key_from_request_for_builtin_sp(json_msg: &SJsonValue) -> Option<Ve
  }
  */
  constants::GET_TXN_AUTHR_AGRMT => {
  - match (json_msg["version"].as_str(), json_msg["digest"].as_str(), json_msg["timestamp"].as_str()) {
  + match (json_msg["version"].as_str(), json_msg["digest"].as_str(), json_msg["timestamp"].as_u64()) {
  (None, None, None) => "2:latest".to_owned(),
  (None, None, Some(_ts)) => {
  // TODO validation should check freshness on receiving entities for some moment in the history
  