Remove no longer supported travis

[PatrickGhadban]

Kubernetes doesn't allow travis anymore—prow and github actions are really the two things we support, prow being #1 and actions being limited in scope (just testing, no uploading of artifacts etc). Therefore, removing travis file and its reference in the README

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[k8s-ci-robot]

Hi @PatrickGhadban. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[khoang98]

/ok-to-test

[khoang98]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: khoang98, PatrickGhadban

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