fix(#198): limit tokio threads to 4 (+ main)

harper-ls/src/main.rs

@@ -31,7 +31,9 @@ struct Args {
     stdio: bool,
 }
 
-#[tokio::main]
+// Setting worker threads to 4 means the process will use about 5 threads total
+// This is because worker threads do not include blocking threads
+#[tokio::main(worker_threads = 4)]
 async fn main() -> anyhow::Result<()> {
     let subscriber = FmtSubscriber::builder()
         .map_writer(move |_| stderr)