Update CHANGELOG.md for 0.6.1

Author: sdroege

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 ## [Unreleased]
 
+## [0.6.1]
+
+Julian Hofer:
+- Update book to 0.6
+- book: Fix clippy warnings
+
+Mițca Dumitru:
+- book: Adapt to glib-build-tools breaking change
+
+Sebastian Dröge:
+- gtk4: Use correct length for the `StrV` when passing to C in
+  `ConstraintLayout::add_constraint_from_description()`
+
 ## [0.6.0]
 
 Bilal Elmoussaoui:
@@ -95,4 +108,4 @@ Bilal Elmoussaoui:
 - [gtk: Generate new v4.10 APIs](https://github.com/gtk-rs/gtk4-rs/commit/e70c71658479c022606389c26f33b0065d4a2148)
 
 Marc-Andre Lureau:
-- [Add gdk4-win32](https://github.com/gtk-rs/gtk4-rs/commit/159db780b3b2d6709c41cbdbe20f4b6088fd574a)
+- [Add gdk4-win32](https://github.com/gtk-rs/gtk4-rs/commit/159db780b3b2d6709c41cbdbe20f4b6088fd574a)