Fix images in README

[RaunakShah]

What this PR does / why we need it:
Adding the right container images to README file.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #104

Special notes for your reviewer:

Release note:

Replace container images to match published manifests 

[k8s-ci-robot]

Hi @RaunakShah. Thanks for your PR.

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[divyenpatel]

/lgtm

[divyenpatel]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divyenpatel, RaunakShah

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