Announce block after it is being enacted as new best block (#182)

collator/src/lib.rs

@@ -520,7 +520,12 @@ where
 			)));
 
 		let follow =
-			match cumulus_consensus::follow_polkadot(self.para_id, self.client, polkadot_client) {
+			match cumulus_consensus::follow_polkadot(
+				self.para_id,
+				self.client,
+				polkadot_client,
+				self.announce_block.clone(),
+			) {
 				Ok(follow) => follow,
 				Err(e) => {
 					return Err(error!("Could not start following polkadot: {:?}", e));