message: Remove `Sync` trait bound from reactors error trait
diff: @@ -137,7 +137,7 @@ pub trait Reactor: Sized {
  type Config;
  /// The error type returned by the reactor.
  - type Error: Send + Sync + 'static;
  + type Error: Send + 'static;
  /// Dispatches an event on the reactor.
  ///
  