Update CHANGELOG

Author: PavelSharp

src/CHANGELOG

@@ -7,6 +7,8 @@
 ///   - [y]: Minor version with non-breaking API and library changes
 ///   - [z]: Patch version with no direct changes to the API
 ///
+/// - 2025/09/12 (4.12.8) - Fix nk_window_is_hovered to use current window flags
+                          - Fix nk_utf_decode length check (allow len == NK_UTF_SIZE)
 /// - 2025/04/06 (4.12.7) - Fix text input navigation and mouse scrolling
 /// - 2025/03/29 (4.12.6) - Fix unitialized data in nk_input_char
 /// - 2025/03/05 (4.12.5) - Fix scrolling knob also scrolling parent window, remove dead code