Update CHANGELOG for refs/tags/v0.28.0
Update CHANGELOG for refs/tags/v0.28.0

Signed-off-by: GitHub <1505422b2465e9a84f6fdfaa161078890c593f06@github.com>

bruceadowns/govmomi,vmware/govmomi,vmware/govmomi,bruceadowns/govmomi,bruceadowns/govmomi,vmware/govmomi