proper executable name

src/main.rs

@@ -17,7 +17,7 @@ fn main() -> anyhow::Result<()> {
     let mut args = std::env::args().skip(1);
     if let Some(arg) = args.next() {
         if arg != "-v" {
-            return Err(anyhow!("usage: rwm [-v]"));
+            return Err(anyhow!("usage: rswm [-v]"));
         } else {
             println!(env!("CARGO_PKG_VERSION")); // TODO: test this
             return Ok(());