message: Fix signature of read_tex_list
diff: @@ -577,7 +577,7 @@ void read_tex_list(State& ps, Consumer& consumer) {
  }
  template <class State, class Consumer>
  -void read_tex_list(State& ps, Consumer& consumer, const string& cmd_name) {
  +void read_tex_list(State& ps, Consumer&& consumer, const string& cmd_name) {
  if (cmd_name == "itemize") {
  list_builder<itemize> builder{&consumer};
  read_tex_list(ps, builder);
  