[sas_robot_driver.hpp] Fixed missing virtual keyword in destructor.

Author: mmmarinho

include/sas_core/sas_robot_driver.hpp

@@ -105,7 +105,7 @@ class RobotDriver
     /**
      * @brief Virtual destructor for RobotDriver
      */
-    ~RobotDriver();
+    virtual ~RobotDriver();
 
     /**
      * @brief Get current joint positions