message: Update non-ASCII crate name warning message
diff: @@ -253,8 +253,7 @@ fn check_name(
  if restricted_names::is_non_ascii_name(name) {
  shell.warn(format!(
  "the name `{}` contains non-ASCII characters\n\
  - Support for non-ASCII crate names is experimental and only valid \
  - on the nightly toolchain.",
  + Non-ASCII crate names are not supported by Rust.",
  name
  ))?;
  }
  