Fix clippy warnings in cli module

src/cli.rs

@@ -64,7 +64,7 @@
 //! starting the server. You can also use the `--bind` argument to specify the address to bind the
 //! server to, which defaults to `0.0.0.0:3000`.
 
-use std::{net::SocketAddr, str::FromStr};
+use std::{fmt, net::SocketAddr, str::FromStr};
 
 use twilight_gateway::ShardId;
 
@@ -163,12 +163,13 @@ impl FromStr for Shard {
     }
 }
 
-impl ToString for Shard {
+impl fmt::Display for Shard {
-    fn to_string(&self) -> String {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        format!("{}:{}", self.id, self.total)
+        write!(f, "{}:{}", self.id, self.total)
     }
 }
 
+#[allow(clippy::from_over_into)]
 impl Into<ShardId> for Shard {
     fn into(self) -> ShardId {
         ShardId::new(self.id, self.total)