message: Update readme for 1.15
diff: @@ -20,17 +20,17 @@ The C# extension is powered by [OmniSharp](https://github.com/OmniSharp/omnishar
  * [Documentation](https://code.visualstudio.com/docs/languages/csharp)
  * [Video Tutorial compiling with .NET Core](https://channel9.msdn.com/Blogs/dotnet/Get-started-VSCode-Csharp-NET-Core-Windows)
  -### What's New in 1.14.0
  -
  -* Support for C# 7.2
  -* Debugger support for extracting source files embedded in PDBs
  -* Preliminary support for Linux ARM debugging
  -* Improved Symbol/Documentation text display
  -* Addressed problems with projects not being refreshed by OmniSharp after a package restore
  -* Added option to disable warning about project.json deprecation
  +### What's New in 1.15.0
  +
  +* Debugger support for Source Link and Symbol Servers
  +* Added support for downloading and launching prerelease versions of the OmniSharp server
  +* Improved the status bar display for OmniSharp Server and selected project information
  +* Added CodeLens for running and debugging all tests in a test class
  +* Performance improvements when OmniSharp scans for projects
  +* Improvements for projects containing XAML files
  * Many other bug fixes!
  -See our [change log](https://github.com/OmniSharp/omnisharp-vscode/blob/v1.14.0/CHANGELOG.md) for all of the updates.
  +See our [change log](https://github.com/OmniSharp/omnisharp-vscode/blob/v1.15.0/CHANGELOG.md) for more detail.
  ### Supported Operating Systems for Debugging
  @@ -47,16 +47,18 @@ See our [change log](https://github.com/OmniSharp/omnisharp-vscode/blob/v1.14.0/
  This list is currently the same as the x64 .NET Core 2.0 operating systems (see [.NET Core list](https://github.com/dotnet/core/blob/master/roadmap.md#net-core-20---supported-os-versions)). Note that other Linux distributions will likely work as well as long as they include glibc, OpenSSL 1.0, and libunwind.
  ### Found a Bug?
  +
  Please file any issues at https://github.com/OmniSharp/omnisharp-vscode/issues.
  ### Debugging
  +
  The C# extension now supports basic debugging capabilities! See http://aka.ms/vscclrdebugger for details.
  ### Development
  First install:
  -* Node.js (newer than 4.3.1)
  -* Npm (newer 2.14.12)
  +* Node.js (8.11.1 or later)
  +* Npm (5.6.0 or later)
  To **run and develop** do the following:
  