Added Update method to report on dbus

- Update method, updates timestamp and readings

Tested:
  - Added new unit tests covering update method
  - All existing unit tests are passing

Change-Id: I6b3829126d9060dbaf436cbf8e6917294dc03134
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
diff --git a/src/interfaces/sensor_listener.hpp b/src/interfaces/sensor_listener.hpp
index 9a2f0a2..9406da6 100644
--- a/src/interfaces/sensor_listener.hpp
+++ b/src/interfaces/sensor_listener.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <optional>
 
 namespace interfaces