Clarify Effect of ADAL API Deprectation

[patrickdillon]

I believe this announcement about the deprecation of the ADAL API will affect the adal package.

The recommended replacement library https://github.com/microsoftgraph/msgraph-sdk-go-core is described as:

The Microsoft Graph SDK for Go is currently in preview. Use of this SDK in production is not supported.

In this document: https://docs.microsoft.com/en-us/graph/sdks/create-client?tabs=Go

It would be helpful to know the status of the adal package in this library and the recommended authentication method with Golang.

[patrickdillon]

Nevermind. I think this is answered by this: #636