Add missing comment about HTTP/2's enable_connect_protocol

src/cow_http2_machine.erl

@@ -133,6 +133,7 @@
 		initial_window_size => 65535
 %		max_frame_size => 16384
 %		max_header_list_size => infinity
+%		enable_connect_protocol => false
 	} :: map(),
 	next_settings = undefined :: undefined | map(),
 	remote_settings = #{