docs(CHANGES): Note latest libvcs update

Author: tony

CHANGES

@@ -21,6 +21,15 @@ $ pipx install --suffix=@next 'vcspull' --pip-args '\--pre' --force
 
 <!-- Maintainers, insert changes / features for the next release here -->
 
+**Maintenance release, no features or fixes**
+
+### Internal
+
+- Bump libvcs 0.18.1 -> 0.19.0 (#408)
+
+  Refactor of sync and commands. Syncing now uses commands instead of invoking
+  directly through `run()`.
+
 ## vcspull v1.16.0 (2022-10-23)
 
 **Maintenance release, no features or fixes**