Update Compatibility Table in Readme

[austinorth]

Motivation

I noticed that the compatibility table was not updated to reflect the release of 1.13.0 from beta.

What I Did

Updated the compatibility table to remove "Beta" from 1.13.x row since it is now out of beta. 🤗

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Hi @austinorth. Thanks for your PR.

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[rifelpet]

Thanks for the update!
/ok-to-test
/lgtm

[justinsb]

Thanks @austinorth

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: austinorth, justinsb

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