LU-11266 build: update changelog for Ubuntu

Record the version that we are building

Test-Parameters: trivial

Change-Id: Ic4ef5e906bffcdebc82a3db44beff0bfd95b4b77
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/33021


Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>