reduced warnings

src/providers/hanime.rs

@@ -1,5 +1,4 @@
 use std::vec;
-use std::env;
 use error_chain::error_chain;
 use futures::future::join_all;
 use wreq::Client;
@@ -9,7 +8,6 @@ use crate::providers::Provider;
 use crate::util::cache::VideoCache;
 use crate::videos::{self, VideoItem};
 use crate::DbPool;
-use crate::USER_AGENT; // Make sure Provider trait is imported
 
 error_chain! {
     foreign_links {