message: fix(http1): http1_title_case_headers should move Builder
diff: @@ -239,7 +239,7 @@ impl<I, E> Builder<I, E> {
  /// Default is false.
  #[cfg(feature = "http1")]
  #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
  - pub fn http1_title_case_headers(&mut self, val: bool) -> &mut Self {
  + pub fn http1_title_case_headers(mut self, val: bool) -> Self {
  self.protocol.http1_title_case_headers(val);
  self
  }
  