chore: update changelog

Author: sebcrozet

CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+## Unreleased
+
+### Added
+- `println!` support for shaders running on the CPU backend (`khal-std`).
+
+### Changed
+- Switch `spirv-std` and `spirv-std-macros` to the published `0.10.0-alpha.1` release (previously pinned to a git revision).
+- Cache coroutines on the CPU backend for improved performance.
+- Enable incremental builds in the workspace to work around a `rust-gpu` issue where the example shader entrypoint was being dropped.