Add support for -h/--help arg

Co-authored-by: Johann Hemmann <johann.hemmann@proton.me>

src/main.rs

@@ -30,10 +30,13 @@ fn notmain() -> Result<i32> {
     let raw_args = env::args().skip(1).collect::<Vec<_>>();
 
     // If there's no argument provided, print the help message
-    if raw_args.is_empty()
-        || (raw_args.len() == 1 && (raw_args[0] == "--help" || raw_args[0] == "-h"))
-    {
-        eprintln!("flip-link: adds zero-cost stack overflow protection to your embedded programs\nYou should not use flip-link directly from command line, use flip-link as your default linker instead. \n\nFor detailed usage, check https://github.com/knurling-rs/flip-link");
+    if matches!(a.as_slice(), [] | ["--help" | "-h"]) {
+        eprintln!(
+            "flip-link: adds zero-cost stack overflow protection to your \
+            embedded programs\nYou should not use flip-link directly from \
+            command line, use flip-link as your default linker instead. \n\n\
+            For detailed usage, check https://github.com/knurling-rs/flip-link"
+        );
         return Ok(0);
     }