Update CHANGELOG.md (#19080)

* Update CHANGELOG.md * Update CHANGELOG.md
Azure · Feb 27, 2021 · 91f2566 · 91f2566
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diff --git a/sdk/storage/Azure.Storage.Blobs/CHANGELOG.md b/sdk/storage/Azure.Storage.Blobs/CHANGELOG.md
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 # Release History
 
 ## 12.9.0-beta.2 (Unreleased)
-
+ - Fixed bug where `Stream` returned by `BlockBlobClient.OpenWrite` could corrupt blocks if flushed between writes.
 
 ## 12.9.0-beta.1 (2021-02-09)
 - Added support for service version 2020-06-12.