fix build

src/main.rs

@@ -42,7 +42,7 @@ struct Args {
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let args = Args::parse();
-    if let Some(log_to) = args.log_to {
+    if let Some(ref log_to) = args.log_to {
         flexi_logger::Logger::try_with_env_or_str("info")?
             .log_to_file(FileSpec::default().directory(&log_to))
             .log_to_stdout()