Add release notes for RubyInstaller-4.0.1-1

Author: larskanis

CHANGELOG-4.0.md

@@ -1,3 +1,24 @@
+## RubyInstaller-4.0.1-1 - 2026-01-15
+
+### Added
+- Add the missing `rdbg` executable. #474
+
+### Changed
+- Update to ruby-4.0.1, see [release notes](https://www.ruby-lang.org/en/news/2026/01/13/ruby-4-0-1-released/).
+- Compact ENV display when `ridk enable`. #470
+- Fix possible crash in `ridk enable` when searching the Windows registry.
+- Check and add directory `etc/ssl/certs` in `c_rehash.rb`. #472
+- Improve startmenu introduced in Ruby-4.0:
+  - Various optical and behaviour improvements. #469
+  - Add mouse event handling to classic terminal and avoid threads. #475
+  - Return to startmenu from irb and ridk
+- Preliminary support for MSYS2 environment `clang64` . #471
+- Update links to point to the correct repository. #463
+
+### Removed
+- Remove libgcc_s_seh-1.dll. It is no longer necessary. #467
+
+
 ## RubyInstaller-4.0.0-1 - 2025-12-27
 
 This is the first release based on ruby-4.0.x: https://www.ruby-lang.org/en/news/2025/12/25/ruby-4-0-0-released/