message: Allow 'latest' alias for most recent crate version
  Allow "latest" as an additional URL alias (together with 'newest') for accesing the most recent crate version.
  Fixes
diff: @@ -232,7 +232,7 @@ fn match_version(conn: &Connection, name: &str, version: Option<&str>) -> Option
  Err(_) => None,
  }
  })
  - .map(|v| if v == "newest" { "*".to_owned() } else { v })
  + .map(|v| if v == "newest" || v == "latest" { "*".to_owned() } else { v })
  .unwrap_or("*".to_string());
  let versions = {
  