Update docs, cleanup for 4.0.0 release

crates/dht/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "librqbit-dht"
-version = "4.0.0-beta.3"
+version = "4.0.0"
 edition = "2021"
 description = "DHT implementation, used in rqbit torrent client."
 license = "Apache-2.0"
@@ -34,7 +34,7 @@ indexmap = "2"
 dashmap = {version = "5.5.3", features = ["serde"]}
 
 clone_to_owned = {path="../clone_to_owned", package="librqbit-clone-to-owned", version = "2.2.1"}
-librqbit-core = {path="../librqbit_core", version = "3.2.0"}
+librqbit-core = {path="../librqbit_core", version = "3.2.1"}
 chrono = {version = "0.4.31", features = ["serde"]}
 
 [dev-dependencies]

crates/dht/src/peer_store.rs

@@ -209,6 +209,7 @@ impl PeerStore {
         Vec::new()
     }
 
+    #[allow(dead_code)]
     pub fn garbage_collect_peers(&self) {
         todo!()
     }