Adds empty line for help command in leo CLI

- clap 2.X has an issue with adding empty line in the end
- proper fixing of this problem should be by updating to V3

leo/main.rs

@@ -84,6 +84,7 @@ fn main() -> Result<(), CLIError> {
             Updater::print_cli();
 
             help.print_help()?;
+            println!();
             Ok(())
         }
     }