don't print "Error" before help strings

src/main.rs

@@ -1,12 +1,10 @@
-use anyhow::Result;
 use clap::Parser;
 
 mod bng;
 mod cli;
 
-fn main() -> Result<()> {
-    let args = cli::Args::try_parse()?;
+fn main() {
+    let args = cli::BngCli::parse();
     #[cfg(debug_assertions)]
     println!("{:?}", args);
-    Ok(())
 }