Increase version to 5.0.16 and update Readme
Tidy up readme markdown
#define OS_MAJOR_VERSION 5 /**< @brief Major version number */
#define OS_MINOR_VERSION 0 /**< @brief Minor version number */
-#define OS_REVISION 15 /**< @brief Revision number */
+#define OS_REVISION 16 /**< @brief Revision number */
#define OS_MISSION_REV 0 /**< @brief Mission revision */
/**
