initial changelog commit for 4.5 (#1428)
initial changelog commit for 4.5 (#1428)

* initial changelog commit for 4.5

* add telem

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