Merge pull request #222 from vladon/fix/unused-import-warning

fix: add #[cfg(test)] to unused ProxyError import

src/protocol/tls.rs

@@ -7,6 +7,7 @@
 #![allow(dead_code)]
 
 use crate::crypto::{sha256_hmac, SecureRandom};
+#[cfg(test)]
 use crate::error::ProxyError;
 use super::constants::*;
 use std::time::{SystemTime, UNIX_EPOCH};