docs: fix changelog release dates

Author: Rogdham

CHANGELOG.md

@@ -2,11 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
-## 0.19.1 (November 13, 2025)
+## 0.19.1 (December 13, 2025)
 
 - Fix `SeekableZstdFile` write table entries on 32-bits architectures when there is a huge number of entries
 
-## 0.19.0 (November 7, 2025)
+## 0.19.0 (December 7, 2025)
 
 - The project has been completely refactored to use the Zstandard implementation from the standard library ([PEP-784](https://peps.python.org/pep-0784/))
 - The refactor has some minor impact on public APIs, such as changing the exception raised on invalid input