Merge pull request #8 from lcobucci/fix-documentation

Use correct interface in documentation

README.md

@@ -129,9 +129,8 @@ use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
 use Zend\Diactoros\Response;
-use Zend\Diactoros\ServerRequest;
 
-final class MyHandler implements ServerRequestInterface
+final class MyHandler implements RequestHandlerInterface
 {
     public function handle(ServerRequestInterface $request): ResponseInterface
     {