v3.0.0

Fixed

• Replace multiple slashes at the beginning of a path with a single one to avoid
  open redirects
• Avoid updating ResponseWriter.Status() if the status has already been
  written when ResponseWriter.WriteHeader() is called twice

Changed

• ResponseWriter now only implements http interfaces (Flusher, Hijacker,
  CloseNotifier) if the wrapped http.ResponseWriter does. This is a breaking
  change to make ResponseWriter's interface support more accurate

Added

• ResponseWriter now implements io.ReaderFrom to more efficiently send
  responses via io.Copy