[ReleasePR confluent] updated readme with new preview version#1646

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openapi-sdkautomation[bot] wants to merge 1 commit intoAzure:masterfrom AzureSDKAutomation:sdkAuto/confluent

Commits on Apr 29, 2021

CodeGen from PR 13885 in Azure/azure-rest-api-specs
SDKAuto
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