Mention the metadata version and date at the top of the metadata page

nedbat · nedbat · commit f714ffd068c7 · 2025-06-18T06:53:26.000-04:00
diff --git a/source/specifications/core-metadata.rst b/source/specifications/core-metadata.rst
@@ -6,6 +6,8 @@
 Core metadata specifications
 ============================
 
+This page describes version 2.4, approved in August 2024.
+
 Fields defined in the following specification should be considered valid,
 complete and not subject to change. The required fields are:
 
