split keys_changed for stronger-type overloads

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

src/api/mod.rs

@@ -6,7 +6,6 @@ extern crate conduit_core as conduit;
 extern crate conduit_service as service;
 
 pub(crate) use conduit::{debug_info, pdu::PduEvent, utils, Error, Result};
-pub(crate) use service::services;
 
 pub(crate) use self::router::{Ruma, RumaResponse, State};