DiagnosticRelatedInformation Location should be an Location object

[drsoran]

Currently the DiagnosticRelatedInformation.Location property is a string. I think this is not correct in sense of Language Server Protocol. I think they expect Location to be an Location object with URI and Range.

I tried to pass a string but VS Code then displays related messages as:

undefined(undefined, undefined): message

[drsoran]

Possible solution prepared in PR #176

[david-driscoll]

@drsoran I think you're correct. Thanks for the find!