docs fixes

README.md

@@ -81,15 +81,15 @@ Type | Required | Description
 -----|----------|------------
 `Psr\Container\ContainerInterface` | No | The custom container instance
 
-### `handlerAttribute(string $handlerAttribute)`
+### `handlerAttribute`
 
 Configures the attribute name used to get the handler reference in the server request. The default is `request-handler`.
 
 Type | Required | Description
 -----|----------|------------
 `string` | Yes | The new attribute name
 
-### `continueOnEmpty(bool $continueOnEmpty)`
+### `continueOnEmpty`
 
 If the server request attribute is empty or does not exists, an exception is throwed. This function changes this behavior to continue with the next middleware.