Print launch command name on failure

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - New CLI flag `--hold` for keeping Alacritty opened after its child process exits
 - Escape sequence to save and restore window title from stack
 - Alternate scroll escape sequence (`CSI ? 1007 h` / `CSI ? 1007 l`)
+- Print name of launch command if Alacritty failed to execute it
 
 ### Changed
 

alacritty_terminal/src/tty/unix.rs

@@ -236,7 +236,7 @@ pub fn new<C>(config: &Config<C>, size: &SizeInfo, window_id: Option<usize>) ->
             pty.fd.as_raw_fd().on_resize(size);
             pty
         },
-        Err(err) => die!("Failed to spawn command: {}", err),
+        Err(err) => die!("Failed to spawn command '{}': {}", shell.program, err),
     }
 }