message: Warn the user if their wrangler.toml is missing compatibility_date.
  Note that this links to a documentation page which is being added in:
diff: @@ -94,6 +94,13 @@ impl Manifest {
  check_for_duplicate_names(&manifest)?;
  + if manifest.compatibility_date.is_none() {
  + StdOut::warn(&format!(
  + "Your configuration file is missing compatibility_date, so a distant past date is assumed. To get the latest possibly-breaking bug fixes, add this line to your wrangler.toml:\n\n compatibility_date = \"{}\"\n",
  + Utc::now().format("%F")));
  + StdOut::warn("For more information about compatibility dates, see: https://developers.cloudflare.com/workers/platform/compatibility-dates");
  + }
  +
  Ok(manifest)
  }
  