Retry activity send on connection failure (fixes #41)

src/activity_queue.rs

@@ -217,13 +217,12 @@ async fn send(
                 text,
             ))
         }
-        Err(e) => {
+        Err(e) => Err(anyhow!(
-            debug!(
+            "Queueing activity {} to {} for retry after connection failure: {}",
-                "Unable to connect to {}, aborting task {}: {}",
+            task.activity_id,
-                task.inbox, task.activity_id, e
+            task.inbox,
-            );
+            e
-            Ok(())
+        )),
-        }
     }
 }