(maint) Update changelog for MCO-775
(maint) Update changelog for MCO-775

Adds a changelog entry for MCO-775 in the 2.9.x release line.

MikaelSmith/marionette-collective,puppetlabs/marionette-collective,shrug/marionette-collective,puppetlabs/marionette-collective,shrug/marionette-collective,MikaelSmith/marionette-collective,MikaelSmith/marionette-collective,puppetlabs/marionette-collective,shrug/marionette-collective,puppetlabs/marionette-collective,MikaelSmith/marionette-collective,shrug/marionette-collective,puppetlabs/marionette-collective,MikaelSmith/marionette-collective,shrug/marionette-collective,puppetlabs/marionette-collective,shrug/marionette-collective,MikaelSmith/marionette-collective