Add Changelog for Katib v0.16.0-rc.1

[andreyvelich]

I've added Changelog for Katib v0.16.0-rc.1

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

[google-oss-prow]

@andreyvelich: GitHub didn't allow me to request PR reviews from the following users: kubeflow/release-team.

Note that only kubeflow members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

I've added Katib Changelog for Katib v0.16.0-rc.1

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

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[tenzen-y]

Thanks!
/lgtm

[tenzen-y]

/lgtm