print version str at program start

src/config.rs

@@ -43,6 +43,8 @@ pub enum GroupId {
 pub const TEST_EVENT: EventU32TypedSev<SeverityInfo> =
     EventU32TypedSev::<SeverityInfo>::new(GroupId::Tmtc as u16, 0);
 
+pub const VERSION: Option<&str> = option_env!("CARGO_PKG_VERSION");
+
 lazy_static! {
     pub static ref HOME_PATH: PathBuf = {
         let mut home_path = PathBuf::new();