docs(changelog): prepare for release 3.1.3.Final

CHANGELOG.adoc

@@ -11,6 +11,18 @@ All notable changes to Apiman will be documented here (as of Apiman 3).
 
 === Removed
 
+=== Fixed
+// end::3.2.0-SNAPSHOT[]
+
+// tag::3.1.3.Final[]
+== 3.2.0-SNAPSHOT
+
+=== Added
+
+=== Changed
+
+=== Removed
+
 === Fixed
 
 * [gateway]: Use UTC for Time Restricted-Access-Policy. The Gateway used the configured local (server) time instead of UTC while applying the rules. This could have lead to a mismatch between configuration (UTC) and execution.
@@ -20,7 +32,7 @@ By https://github.com/volkflo[Florian Volk (@volkflo)^].
 
 * [common-config]: Fix an edge case in EnvLookup where `List.of` might be used with a `null` element which results in a NPE and metrics not rendering with certain configurations. By https://github.com/msavy[Marc Savy (@msavy)^].
 
-// end::3.2.0-SNAPSHOT[]
+// end::3.1.3.Final[]
 
 // tag::3.1.2.Final[]
 == 3.1.2.Final