Fix attribute name

[eByte23]

When adding an attribute to a Class,Method etc..

TestAttribute is valid as [Test] or [TestAttribute]

You are always forced to use [TestAttribute] in intellisense but when manually changed to [Test] it is still valid syntax.

As soon as you use visual studio it gives info message to say can be shortened.

[willl]

Thanks for raising this, it's a long-standing known issue.

See: #7 (comment)

[eByte23]

Ahh cool. Sorry searched attributes before opening but that didn't show up.
As long as it's known.

[willl]

All good.

Also noticed it reported elsewhere (by editors that use omnisharp-roslyn).
Eg: dotnet/vscode-csharp#393

[filipw]

Should be addressed in #840

[filipw]

this has been fixed in #840 and subsequent PRs