Add changelog entry for LOG4J2-1840
Add changelog entry for LOG4J2-1840

This closes #65.

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