• added: Log rejections from built-in extractors with the
  axum::rejection=trace target (#1890)
• fixed: Fixed performance regression with Router::nest introduced in
  0.6.0. nest now flattens the routes which performs better (#1711)
• fixed: Extracting MatchedPath in nested handlers now gives the full
  matched path, including the nested path (#1711)
• added: Implement Deref and DerefMut for built-in extractors (#1922)