took some suggestions from clippy

README.md

@@ -32,15 +32,15 @@ This will create proxy server on 8080 and use localhost:1080 as a Socks5 Proxy
 There are a few options for using `sthp`.
 
 ```text
-USAGE:
-    sthp [OPTIONS]
-
-OPTIONS:
-    -h, --help                             Print help information
-        --listen-ip <LISTEN_IP>            [default: 0.0.0.0]
-    -p, --port <PORT>                      port where Http proxy should listen [default: 8080]
-    -P, --password <PASSWORD>              Socks5 password
-    -s, --socks-address <SOCKS_ADDRESS>    Socks5 proxy address [default: 127.0.0.1:1080]
-    -u, --username <USERNAME>              Socks5 username
-    -V, --version                          Print version information    
+Usage: sthp [OPTIONS]
+
+Options:
+  -p, --port <PORT>                        port where Http proxy should listen [default: 8080]
+      --listen-ip <LISTEN_IP>              [default: 0.0.0.0]
+  -u, --username <USERNAME>                Socks5 username
+  -P, --password <PASSWORD>                Socks5 password
+  -s, --socks-address <SOCKS_ADDRESS>      Socks5 proxy address [default: 127.0.0.1:1080]
+      --allowed-domains <ALLOWED_DOMAINS>  Comma-separated list of allowed domains
+  -h, --help                               Print help information
+  -V, --version                            Print version information
 ```

src/main.rs

@@ -55,10 +55,9 @@ async fn main() -> Result<()> {
     let socks_address = args.socks_address;
     let port = args.port;
 
-    let auth = match args.auth {
-        Some(auth) => Some(Auth::new(auth.username, auth.password)),
-        None => None,
-    };
+    let auth = args
+        .auth
+        .map(|auth| Auth::new(auth.username, auth.password));
     let auth = &*Box::leak(Box::new(auth));
 
     let addr = SocketAddr::from((args.listen_ip, port));
@@ -72,10 +71,9 @@ async fn main() -> Result<()> {
     };
     let client: Client<SocksConnector<HttpConnector>> = hyper::Client::builder().build(connector);
     let client = &*Box::leak(Box::new(client));
-    let allowed_domains = match args.allowed_domains {
-        Some(domains) => Some(domains.split(',').map(|d| d.trim().to_owned()).collect()),
-        None => None,
-    };
+    let allowed_domains = args
+        .allowed_domains
+        .map(|domains| domains.split(',').map(|d| d.trim().to_owned()).collect());
     let allowed_domains = &*Box::leak(Box::new(allowed_domains));
     let make_service = make_service_fn(move |_| async move {
         Ok::<_, Infallible>(service_fn(move |req| {