Add Chamber fixes to changelog

We recently merged two commits that update Chamber configuration. We
want people to be able to easily understand what is included in each
release, so I am adding these changes to the changelog.

Change-Id: Ie2155a3846ee80881720ecf3ab8348379525edf9
Reviewed-on: http://gerrit.causes.com/42490
Reviewed-by: Joe Lencioni <joe.lencioni@brigade.com>
Tested-by: jenkins <jenkins@causes.com>