Update changelog for MSAL 481 (#1584)
Update changelog for MSAL 481 (#1584)

* Update changelog.txt

* Update changelog.txt

* Update changelog.txt

* Update changelog.txt

AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet,AzureAD/microsoft-authentication-library-for-dotnet