[Identity] Changelog updates before releasing (#11646)

* Release date in the Identity changelog

* Update CHANGELOG.md

Two updates on the CHANGELOG based on recent PRs.

* Updated based on private feedback by Vinay

* Oh, actually specifying tomorrow as the release date!

sdk/identity/identity/CHANGELOG.md

@@ -1,10 +1,12 @@
 # Release History
 
-## 1.2.0-beta.2 (Unreleased)
+## 1.2.0-beta.2 (2020-10-06)
 
 - `DefaultAzureCredential` now by default shows the Device Code message on the console. This can still be overwritten with a custom behavior by specifying a function as the third parameter, `userPromptCallback`.
 - Added support for multiple clouds on `VisualStudioCodeCredential`. Fixes customer issue [11452](https://github.com/Azure/azure-sdk-for-js/issues/11452).
 - `ManagedIdentityCredential` has been aligned with other languages, now treating expected errors properly. This fixes customer issue [11451](https://github.com/Azure/azure-sdk-for-js/issues/11451).
+- `InteractiveBrowserCredential` authentication now uses the silent flow if the user provides a cache and authentication record for lookup.
+- Added Active Directory Federation Services authority host support to the node credentials.
 - Reverted a change in 1.2.0-beta.1 which moved `@rollup/plugin-json` from `devDependencies` to `dependencies`. `@rollup/plugin-json` was placed as a dependency due to an oversight, and it is not a necessary dependency for `@azure/identity`.
 
 ## 1.2.0-beta.1 (2020-09-08)