Update & improve order in v3.19.0 changelog entry

Author: sadielbartholomew

Changelog.rst

@@ -1,15 +1,14 @@
-Version NEXTVERSION
+Version 3.19.0
 --------------
 
-**2026-01-??**
+**2026-01-16**
 
 * Write Zarr v3 datasets with `cf.write`
   (https://github.com/NCAS-CMS/cf-python/issues/895)
 * Read Zarr v2 and v3 datasets that contain a group hierarchy with
   `cf.read` (https://github.com/NCAS-CMS/cf-python/issues/894)
 * Reduce the time taken to import `cf`
   (https://github.com/NCAS-CMS/cf-python/issues/902)
-* New optional dependency: ``zarr>=3.1.3``
 * New function to control the creation of cached elements during data
   display: `cf.display_data`
   (https://github.com/NCAS-CMS/cf-python/issues/913)
@@ -23,6 +22,7 @@ Version NEXTVERSION
   (https://github.com/NCAS-CMS/cf-python/issues/902)
 * Reduce the time taken to import `cf`
   (https://github.com/NCAS-CMS/cf-python/issues/902)
+* New optional dependency: ``zarr>=3.1.3``
 * Changed dependency: ``cfdm>=1.13.0.0, <1.13.1.0``
 
 ----