update changelog

Author: Freax13

Changelog.md

@@ -1,5 +1,21 @@
 # Unreleased
 
+# 0.15.1 – 2024-03-19
+
+## New Features
+
+- [add constructor for `InterruptStackFrameValue`](https://github.com/rust-osdev/x86_64/pull/467)
+- [add `Cr3::write_pcid_no_flush`](https://github.com/rust-osdev/x86_64/pull/472)
+
+## Fixes
+
+- [properly jump the address gap in CleanUp](https://github.com/rust-osdev/x86_64/pull/469)
+
+## Other Improvements
+
+- [added help on update_flags to get flags](https://github.com/rust-osdev/x86_64/pull/465)
+- [expose DEBUG_STR more directly](https://github.com/rust-osdev/x86_64/pull/471)
+
 # 0.15.0 – 2024-03-04
 
 ## Breaking changes