Forgot to add a changelog for #167 (#168)

Author: toku-sa-n

CHANGELOG.md

@@ -1,6 +1,12 @@
 # Changelog
 
 ## Unreleased - ReleaseDate
+### Changed
+- `registers::Capability` now has read-only accessors instead of read-write ones. ([#167])
+- `registers::doorbell::Register` is renamed to `registers::doorbell::Doorbell`. The former still exists, but is deprecated now. ([#167])
+
+### Deprecated
+- `registers::doorbell::Register` in favor of `registers::doorbell::Doorbell`. ([#167])
 
 ## 0.9.2 - 2023-07-19
 ### Added
@@ -194,3 +200,5 @@
 ## 0.1.0 - 2021-01-22
 ### Added
 - Initial version.
+
+[#167]: https://github.com/rust-osdev/xhci/pull/167