simpler way of specifying no command

src/main.rs

@@ -3,7 +3,7 @@ use std::process::exit;
 use std::io;
 
 use clap::{
-    Arg, SubCommand, AppSettings, ArgMatches, command, value_parser,
+    Arg, SubCommand, ArgMatches, command, value_parser,
 };
 use chrono::Utc;
 use regex::Regex;
@@ -128,7 +128,7 @@ fn main() {
 
     // Now declar this app's cli
     let matches = command!()
-        .setting(AppSettings::SubcommandRequired)
+        .subcommand_required(true)
 
         .subcommand(SubCommand::with_name("archive")
             .visible_alias("a")