fix on log after upgrade

src/main.rs

@@ -43,17 +43,19 @@ fn main() {
             }
         }
         use flexi_logger::*;
-        Logger::with_env_or_str("debug")
+        Logger::try_with_env_or_str("debug")
-            .log_to_file()
+            .map(|x| {
+                x.log_to_file(FileSpec::default().directory(path))
                     .format(opt_format)
                     .rotate(
                         Criterion::Age(Age::Day),
                         Naming::Timestamps,
                         Cleanup::KeepLogFiles(6),
                     )
-            .directory(path)
                     .start()
                     .ok();
+            })
+            .ok();
     }
     if args.is_empty() {
         std::thread::spawn(move || start_server(false, false));