message: fix(client): remove config requirement for Connect
  Remove requirement when calling client::Config::connector() that the connector implements Connect.
  Removing this requirement allows users to set the connector back to UseDefaultConnector. Previously,
  this was not possible.
diff: @@ -322,7 +322,7 @@ impl<C, B> Config<C, B> {
  /// Set the `Connect` type to be used.
  #[inline]
  - pub fn connector<CC: Connect>(self, val: CC) -> Config<CC, B> {
  + pub fn connector<CC>(self, val: CC) -> Config<CC, B> {
  Config {
  _body_type: self._body_type,
  //connect_timeout: self.connect_timeout,
  