Update changelog

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

CHANGES.txt

@@ -1,3 +1,21 @@
+stratisd 3.5.3 (UNRELEASED)
+===========================
+Recommended Rust toolchain version: 1.68.0
+Lowest supported Rust toolchain version: 1.66.1
+
+Recommended development platform for Python development: Fedora 37
+
+- Send out D-Bus signals properly when blockdevs are added to pool:
+  https://github.com/stratis-storage/stratisd/issues/3267
+  https://github.com/stratis-storage/stratisd/pull/3288
+
+- Increase env_logger dependency lower bound to 0.10.0:
+  https://github.com/stratis-storage/stratisd/pull/3289
+
+- Tidies and Maintenance:
+  https://github.com/stratis-storage/stratisd/pull/3255
+
+
 stratisd 3.5.2
 ==============
 Recommended Rust toolchain version: 1.68.0