Update to 2021 edition

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "epp-client"
 version = "0.6.0"
-edition = "2018"
+edition = "2021"
 license = "MIT"
 description = "EPP (Extensible Provisioning Protocol) Client Library for Domain Registration and Management"
 repository = "https://github.com/masalachai/epp-client"

src/client.rs

@@ -1,4 +1,3 @@
-use std::convert::TryInto;
 use std::io;
 use std::sync::Arc;
 use std::time::Duration;

src/connection.rs

@@ -1,6 +1,5 @@
 //! Manages registry connections and reading/writing to them
 
-use std::convert::TryInto;
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};