Fix some warnings

src/main.rs

@@ -4,7 +4,7 @@
 // This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
 // See LICENSE file in the project root for full license text.
 
-use std::{env, path::PathBuf, sync::Arc, time::Duration};
+use std::{path::PathBuf, sync::Arc, time::Duration};
 
 use clap::Parser;