[DI] Added missing deprecation in changelog

Author: ro0NL

CHANGELOG.md

@@ -9,6 +9,7 @@ CHANGELOG
  * deprecated the ability to set or unset a private service with the `Container::set()` method
  * deprecated the ability to check for the existence of a private service with the `Container::has()` method
  * deprecated the ability to request a private service with the `Container::get()` method
+ * deprecated support for generating a dumped `Container` without populating the method map
 
 3.0.0
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