[PATCH v4] CHANGELOG.md: Start new "unstable" section

[Henry Wang <Henry.Wang@xxxxxxx>]

Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
---
v4:
- Set the release date.
---
 CHANGELOG.md | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ca7969699..cbdc9bceac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,15 @@ Notable changes to Xen will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
-## 
[4.18.0](https://xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.18.0)
 - 2023-XX-XX
+## [unstable 
UNRELEASED](https://xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=staging)
 - TBD
+
+### Changed
+
+### Added
+
+### Removed
+
+## 
[4.18.0](https://xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.18.0)
 - 2023-11-16
 
 ### Changed
  - Repurpose command line gnttab_max_{maptrack_,}frames options so they don't
-- 
2.25.1