message: Add line about `csharp.unitTestDebuggingOptions.type` option to changelog
diff: * Switched to a new CDN for the extension's dependencies which should deliver an improved download experience ([#1542](https://github.com/OmniSharp/omnisharp-vscode/issues/1542))
  * Automatically activate the extension when opening workspaces that contain any .csproj, .sln, or .csx files ([#1375](https://github.com/OmniSharp/omnisharp-vscode/issues/1375), [#1150](https://github.com/OmniSharp/omnisharp-vscode/issues/1150), PR: [#1592](https://github.com/OmniSharp/omnisharp-vscode/pull/1592)))
  * Added nag message when project.json projects are opened by OmniSharp, to serve as a reminder to migrate projects from project.json to .csproj. (PR: [#1657](https://github.com/OmniSharp/omnisharp-vscode/pull/1657))
  +* Added `type` property to `csharp.unitTestDebuggingOptions` to allow debugging tests with 'clr' debugger (Windows only). ([#1586](https://github.com/OmniSharp/omnisharp-vscode/issues/1586), PR: [#1663](https://github.com/OmniSharp/omnisharp-vscode/pull/1663))
  * The `[csharp]` configuration section is now checked for formatting options. ([#1574](https://github.com/OmniSharp/omnisharp-vscode/issues/1574)) _(Contributed by [@filipw](https://github.com/filipw))_
  * All project systems (project.json, MSBuild, CSX Scripting) now support an "Enabled" property that can be configured in omnisharp.json. (PR: [omnisharp-roslyn#902](https://github.com/OmniSharp/omnisharp-roslyn/pull/902)) _(Contributed by [@filipw](https://github.com/filipw))_
  * The OmniSharp server has been updated to Roslyn 2.3.0-beta2, which adds support for C# 7.1 (PRs: [omnisharp-roslyn#900](https://github.com/OmniSharp/omnisharp-roslyn/pull/900) and [omnisharp-roslyn#901](https://github.com/OmniSharp/omnisharp-roslyn/pull/901))
  