heads up when running roller from master branch

[Michael Bien]

Hello Everyone,

Just a heads up in case you are building and running apache roller from 
master, please rebuild your instance with the latest changes.

It contains an important dependency update 
(https://github.com/apache/roller/pull/106) for log4j 2 which suffered 
from a RCE security vulnerability, which was fixed in the latest version.

Apache Roller 6.0.2 (latest release) should not be affected by this 
particular vulnerability since it still uses the old log4j 1 library.

best regards,

michael