don't use reference when is_empty-ing

src/main.rs

@@ -31,7 +31,7 @@ async fn main() -> Result<()> {
     let filtered_pull_requests = github::api::filter_out_renovate_pull_requests(all_pull_requests);
     info!("{} pull request(s) left after filtering out dependency updates", &filtered_pull_requests.len());
 
-    if &filtered_pull_requests.is_empty() {
+    if filtered_pull_requests.is_empty() {
         info!("No pull requests left after filtering. Exiting early.");
         return Ok(());
     }