docs(migration): add entries for 2.1.4 and 2.1.5
MODIFY
docs/modules/migration/pages/migrations.adoc
docs/modules/migration/pages/migrations.adoc
Notes for upgrading to newer versions of Apiman.
Unless stated otherwise, the instructions assume that you are upgrading sequentially version to version.
+== Migrating to 2.1.5.Final
+
+No special action should be required, although backing up is always recommended.
+
+== Migrating to 2.1.4.Final
+
+No special action should be required, although backing up is always recommended.
+
== Migrating to 2.1.3.Final
No special action should be required, although backing up is always recommended.

docs(migration): add entries for 2.1.4 and 2.1.5