v1.9-beta20

• Update to latest version of Roslyn (2.0.0-rc) (#676)
• Allow OmniSharp to target C# 7 (#663 and #664)
• Fix spacing around <paramref /> in XML doc comments (#670)
• Improve /typelookup end point to provide better display for nested types and other symbols. (#665)
• Fix NullReferenceException that could be thrown in /autocomplete end point (#674)
• Dramatically improve project search in DotNetProjectSystem (#673)