Changelog 4.39.0. (#3042)

* Changelog 4.39.0. * Update changelog.txt Co-authored-by: jennyf19 <[email protected]> * Update changelog.txt Co-authored-by: jennyf19 <[email protected]>
AzureAD · Nov 30, 2021 · 29d276a · 29d276a
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+4.39.0
+==========
+### New Features:
+**Added new `LogLevel.Always` and logging of important health metrics** to help with diagnostics of MSAL. See [3004](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/3004) and [MSAL logging](https://aka.ms/msal-net-logging).  
+
+### Bug Fixes:
+**Fixed a crash in telemetry API when `AcquireToken*` builder is reused`**. See [3024](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/3024).  
+**Fixed sending an incorrect backup authentication system (CCS) value in B2C apps**. See [2748](https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/issues/2748).  
+
 4.38.0
 ==========
 ### New Features: