message: Fix onDisconnect hooks
diff: @@ -502,7 +502,7 @@ export class GraphQLModule<Config = any, Session = any, Context = any> {
  return (instance &&
  typeof instance !== 'string' &&
  typeof instance !== 'number' &&
  - ('onConnect' in instance));
  + ('onDisconnect' in instance));
  });
  }
  await Promise.all(importsOnDisconnectHooks.map(serviceIdentifier => sessionInjector.callHookWithArgs('onDisconnect', serviceIdentifier, websocket, connectionContext)));
  