CHANGELOG: add v1.5.1 entry

Signed-off-by: Sharath P J <pjsharath28@gmail.com>

Author: pjsharath28

CHANGELOG/CHANGELOG-1.5.md

@@ -1,6 +1,13 @@
 
 <hr>
 
+## v1.5.1(TBD)
+
+### BoltDB
+- [Fix version string not updated for v1.5.0 release](https://github.com/etcd-io/bbolt/pull/1230)
+
+<hr>
+
 ## v1.5.0(2026-06-21)
 There isn't any production code change since v1.5.0-rc.0. Only golang patch version is bumped.