Consider adding MemberNotNullAttribute and MemberNotNullWhenAttribute

[kevinchalet]

The latest ReferenceAssemblyAnnotator bits don't include the (quite) recent MemberNotNullAttribute and MemberNotNullWhenAttribute. Would it make sense to add them? 😃

MemberNotNullAttribute: https://source.dot.net/#System.Private.CoreLib/NullableAttributes.cs,135
MemberNotNullWhenAttribute: https://source.dot.net/#System.Private.CoreLib/NullableAttributes.cs,160

Thanks!

[kevinchalet]

Alright, let's give it a try 😄