Make ReactorShutdownHandle pub
This change makes the ReactorShutdownHandle public via the `pub use`
statement in the module `events`. It should be visiable as it is a
return type from a public method of a public type.
@@ -17,5 +17,5 @@ mod reactor;
mod ws;
pub use error::{ParseError, ReactorError, WebSocketError};
-pub use reactor::{Igniter, Reactor};
+pub use reactor::{Igniter, Reactor, ReactorShutdownSignaler};
pub use ws::{ParseBytes, WebSocketClient, WsResponse};
