Update CHANGELOG.asciidoc

Author: hohwille

CHANGELOG.asciidoc

@@ -8,6 +8,7 @@ Bugfix release of with the following stories:
 
 * https://github.com/devonfw/devon4j/issues/513[#513]: Added support for Quarkus in addition to spring
 * https://github.com/devonfw/devon4j/issues/551[#551]: spring4shell and other CVE fixes required
+* https://github.com/devonfw/devon4j/issues/531[#531]: Update logback to 1.2.9 or higher
 * https://github.com/devonfw/devon4j/issues/533[#533]: Explain why we use Long as primary key
 
 == 2021.04.003