Updated changelog

Author: simlay

CHANGELOG.md

@@ -121,6 +121,7 @@ Released YYYY/MM/DD
 ## Added
 
 * Objective-c bindings generate `From<ChildClass> for ParentClass` as well as `TryFrom<ParentClass> for ChildClass` ([#1883][]).
+* Inherited categories on a given objective-c class generate impl blocks for the parent categories ([#1784][]).
 
 ## Changed
 
@@ -144,6 +145,7 @@ Released YYYY/MM/DD
 
 
 [#1883]: https://github.com/rust-lang/rust-bindgen/issues/1883
+[#1784]: https://github.com/rust-lang/rust-bindgen/issues/1784
 
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