Update changes.rst with entry for adoped release.

FDSN · Jul 14, 2023 · 50c7d50 · 50c7d50
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@@ -6,6 +6,13 @@ Changes
 
 Changes to this specification are listed below.
 
+July 2023
+--------------
+
+* Specification revision 2023-01-18 adopted by FDSN.
+* Reference data were refined following the specification revision.
+
+
 2021
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