Update CHANGELOG

Author: acidtv

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 * #1517 OP prompts for logout when no OP session
 * #1512 client_secret not marked sensitive
+* #1521 Fix 0012 migration loading access token table into memory
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 ### Security
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