Update changelog

CHANGES.txt

@@ -49,6 +49,7 @@ Unreleased Changes (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
   * Adds client_streaming and server_streaming fields to MethodDescriptor.
   * Add "ensure_ascii" parameter to json_format.MessageToJson. This allows smaller
     JSON serializations with UTF-8 or other non-ASCII encodings.
+  * Added experimental support for directly assigning numpy scalars and array.
 
   Compiler
   * Migrate IsDefault(const std::string*) and UnsafeSetDefault(const std::string*)
@@ -88,6 +89,7 @@ Unreleased Changes (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
   * add proto_h flag for speeding up large builds
   * Add missing overload for reference wrapped fields.
   * Add MergedDescriptorDatabase::FindAllFileNames()
+  * RepeatedField now defines an iterator type instead of using a pointer.
 
 
 2022-01-28 version 3.19.4 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)