Fix psalm error (#76)

Author: vjik

src/Renderer/HtmlRenderer.php

@@ -446,6 +446,7 @@ private function renderTemplate(string $path, array $parameters): string
         ob_implicit_flush(false);
 
         try {
+            /** @psalm-suppress PossiblyNullFunctionCall */
             $renderer->bindTo($this)($path, $parameters);
             return ob_get_clean();
         } catch (Throwable $e) {