Add changelog entry for LOG4J2-1227.
Add changelog entry for LOG4J2-1227.

This closes #20

codescale/logging-log4j2,apache/logging-log4j2,lqbweb/logging-log4j2,lburgazzoli/logging-log4j2,xnslong/logging-log4j2,GFriedrich/logging-log4j2,codescale/logging-log4j2,xnslong/logging-log4j2,apache/logging-log4j2,GFriedrich/logging-log4j2,lqbweb/logging-log4j2,xnslong/logging-log4j2,lburgazzoli/logging-log4j2,lburgazzoli/logging-log4j2,codescale/logging-log4j2,lburgazzoli/apache-logging-log4j2,lburgazzoli/apache-logging-log4j2,GFriedrich/logging-log4j2,lburgazzoli/apache-logging-log4j2,apache/logging-log4j2,lqbweb/logging-log4j2