Make Rails arguments optional

Calling rails-new without any arguments fails with error: (error: the following required arguments were not provided: <ARGS>..). Making rails arguments optional allows to simply run rails-new and see what params are required for scaffolding new rails application (for example app name).

src/rails_new.rs

@@ -3,7 +3,7 @@ use clap::{Parser, Subcommand};
 #[derive(Parser)]
 #[command(version, about, long_about = None, subcommand_negates_reqs = true)]
 pub struct Cli {
-    #[clap(trailing_var_arg = true, required = true)]
+    #[clap(trailing_var_arg = true)]
     /// arguments passed to `rails new`
     pub args: Vec<String>,
     #[clap(long, short = 'u', default_value = "3.3.4")]