message: [dev] Improves error message when there is no internet connection
diff: @@ -196,7 +196,7 @@ pub fn get_preview_id(
  verbose: bool,
  ) -> Result<String, failure::Error> {
  let sites_preview = false;
  - let script_id = upload(&mut target, user.as_ref(), sites_preview, verbose)?;
  + let script_id = upload(&mut target, user.as_ref(), sites_preview, verbose).map_err(|_| failure::format_err!("Could not upload your script, check your internet connection or https://www.cloudflarestatus.com/ for any incidents impacting the Cloudflare Workers API."))?;
  Ok(format!(
  "{}{}{}{}",
  &script_id,
  