Deps: minimize Tokio features (#25)

* Deps: use specific Tokio features

* Deps: run `cargo update`

* Refactor: move CLI-parsing outside Tokio runtime

* Fix: use `parse` over `try_parse`

Clap does special things behind the scenes before it exits.

* Refactor: use `tokio::main` macro for convenience

src/main.rs

@@ -47,11 +47,8 @@ enum Command {
 }
 
 #[tokio::main]
-async fn main() -> Result<()> {
-    tracing_subscriber::fmt::init();
-
-    let args = Args::parse();
-    match args.command {
+async fn run(command: Command) -> Result<()> {
+    match command {
         Command::Local {
             local_host,
             local_port,
@@ -69,3 +66,8 @@ async fn main() -> Result<()> {
 
     Ok(())
 }
+
+fn main() -> Result<()> {
+    tracing_subscriber::fmt::init();
+    run(Args::parse().command)
+}