Update changelog

Signed-off-by: mulhern <amulhern@redhat.com>

Author: mulkieran

CHANGES.txt

@@ -6,7 +6,7 @@ Recommended development release: Fedora 41
 - Release devicemapper-rs-sys v0.3.1:
   https://github.com/stratis-storage/devicemapper-rs/pull/953
 
-- Use pkg-config to find header paths in build.rs:
+- devicemapper-rs-sys: Use pkg-config to find header paths in build.rs:
   https://github.com/stratis-storage/devicemapper-rs/pull/952
 
 - Increase rand dependency lower bound to 0.9.0: