Update changelog

Signed-off-by: mulhern <[email protected]>

CHANGES.txt

@@ -1,3 +1,23 @@
+libcryptsetup-rs 0.9.4 (UNRELEASED)
+======================
+Recommended Rust toolchain version: 1.77.0
+Recommended development environment: Fedora 39
+
+- Fix issue where getter and setter used different units:
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/356
+
+- Use once_cell rather than lazy_static for lazy statics:
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/358
+
+- Tidies and Maintenance:
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/361
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/360
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/359
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/357
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/355
+  https://github.com/stratis-storage/libcryptsetup-rs/pull/354
+
+
 libcryptsetup-rs 0.9.3
 ======================
 Recommended Rust toolchain version: 1.76.0