Add Changelog for Katib v0.16.0

[andreyvelich]

I've added Changelog for Katib v0.16.0
Thanks everyone for making successful Katib release!

/cc @johnugeorge @tenzen-y @kubeflow/release-team

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In response to this:

I've added Changelog for Katib v0.16.0
Thanks everyone for making successful Katib release!

/cc @johnugeorge @tenzen-y @kubeflow/release-team

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[andreyvelich]

@johnugeorge @tenzen-y I think, we can merge it if you are ok with the Changelog

[tenzen-y]

Thank you for updating the changelog!

/lgtm