feat: add version command to cli

Author: Brian Ryall

crates/lsp/src/main.rs

@@ -11,9 +11,15 @@ fn main() {
         .args(&[
             arg!(--stdio "specifies to use stdio to communicate with lsp"),
             arg!(--log "write log to file"),
+            arg!(version: -v --version),
         ])
         .get_matches();
 
+    if matches.args_present() && matches.get_flag("version") {
+        print!("{}", std::env!("CARGO_PKG_VERSION"));
+        return;
+    }
+
     setup_logging(matches.get_flag("log"));
 
     beancount_language_server::run_server()