Add the ability to change the informant's prefix (#1221)

* Initial commit

Forked at: 261d701c5b
Parent branch: origin/master

* Add the ability to change the informant's prefix

* Update Cargo.lock

* Update Cargo.lock

* fixed tests

* Rename prefix to informant prefix

polkadot/parachain/test-parachains/adder/collator/src/main.rs

@@ -141,6 +141,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 			id,
 			key,
 			config,
+			None,
 		).map_err(|e| e.into())
 	})?;