fix: use the version environment variable properly

src/main.rs

@@ -42,7 +42,7 @@ impl Error for RunError {}
 fn main() -> Result<(), RunError> {
     for argument in std::env::args() {
         if argument == "-v" || argument == "--version" {
-            println!("CARGO_PKG_VERSION");
+            println!(env!("CARGO_PKG_VERSION"));
             return Ok(());
         }
     }