move read_receipt feature up one level out of rooms.edus.

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/key_value/rooms/mod.rs

@@ -6,6 +6,7 @@ mod lazy_load;
 mod metadata;
 mod outlier;
 mod pdu_metadata;
+mod read_receipt;
 mod search;
 mod short;
 mod state;