Actually enable io on tokio runtime

src/async_utils.rs

@@ -12,6 +12,7 @@ pub use async_trait::async_trait;
 
 pub fn run<F: Future>(future: F) -> F::Output {
   Builder::new_current_thread()
+    .enable_io()
     .build()
     .unwrap()
     .block_on(future)