docs: changelog for version 4.0.0 (#360)

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## 4.0.0
+
+* feat: support updating existing files
+* feat: generate PHP 8 attributes
+* feat: generate API Platform Core `security` properties for classes and properties
+* feat: support for HTTPS URLs of Schema.org
+* feat: add YAML support for Doctrine ORM "resolve entity"
+* feat: support for interface namespaces
+* feat: compatibility with Symfony 6
+* feat: compatibility with PHP 8.1
+* feat: now uses Nette generator
+* fix: the whole code base has been refactored, a log of bugs have been fixed
+
 ## 3.0.0
 
 * Support for [the Web Ontology Language (OWL)](https://en.wikipedia.org/wiki/Web_Ontology_Language) (including for [the ActivityStream vocabulary](https://www.w3.org/TR/activitystreams-core/))