message: remove newline after stacktrace
diff: @@ -204,7 +204,7 @@ fn handle_cause(mut cargo_err: &CargoError, shell: &mut MultiShell) -> bool {
  fn print(error: String, shell: &mut MultiShell) {
  let _ = shell.err().say("\nCaused by:", BLACK);
  - let _ = shell.err().say(format!(" {}\n", error), BLACK);
  + let _ = shell.err().say(format!(" {}", error), BLACK);
  }
  }
  