message: add explaining comment about AWS S3 bug
diff: @@ -121,6 +121,8 @@ impl S3Backend {
  let date_updated = res
  .last_modified
  + // This is a bug from AWS, it should always have a modified date of when it was created if nothing else.
  + // Workaround it by passing now as the modification time, since the exact time doesn't really matter.
  .map_or(Ok(Utc::now()), |lm| parse_timespec(&lm))?;
  let compression = res.content_encoding.and_then(|s| s.parse().ok());
  