Fix the hard code of max depth

build.rs

@@ -6,7 +6,8 @@ include!("src/cli.rs");
 fn main() -> Result<(), Error> {
     let outdir = "completions";
     let app_name = "dust";
-    let mut cmd = build_cli();
+    let max_depth = usize::MAX.to_string();
+    let mut cmd = build_cli(&max_depth);
 
     generate_to(Bash, &mut cmd, app_name, outdir)?;
     generate_to(Zsh, &mut cmd, app_name, outdir)?;