Update README.md

ondrejmirtes · web-flow · commit 613472cde90a · 2022-07-12T11:36:58.000+02:00
diff --git a/README.md b/README.md
@@ -77,6 +77,7 @@ All the documentation lives on the [phpstan.org website](https://phpstan.org/):
 * [PHPDocs Basics](https://phpstan.org/writing-php-code/phpdocs-basics) & [PHPDoc Types](https://phpstan.org/writing-php-code/phpdoc-types)
 * [Extension Library](https://phpstan.org/user-guide/extension-library)
 * [Developing Extensions](https://phpstan.org/developing-extensions/extension-types)
+* [API Reference](https://apiref.phpstan.org/)
 
 ## PHPStan Pro
 
