Changelog update (#339)

* Changelog update

* Changelog updates per feedback

---------

Co-authored-by: Diana Fillingham <diana.fillingham2@dolby.com>

Author: mhelf-dolby

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 3.8.2-beta.1
+
+### Bug Fixes
+
+Introduced improvements that prevent the [VideoViewController](https://api-references.dolby.io/comms-sdk-flutter/dolbyio_comms_sdk_flutter/VideoViewController-class.html) from accessing unmounted [VideoView](https://api-references.dolby.io/comms-sdk-flutter/dolbyio_comms_sdk_flutter/VideoView-class.html) widgets.
+
 ## 3.8.1
 
 ### Features