Detected package downgrade

nukebuild/_build.csproj

@@ -15,7 +15,6 @@
     <PackageReference Include="JetBrains.dotMemoryUnit" Version="3.0.20171219.105559" />
     <PackageReference Include="vswhere" Version="2.6.7" Condition=" '$(OS)' == 'Windows_NT' " />
     <PackageReference Include="ILRepack.NETStandard" Version="2.0.4" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.7.0" />
     <PackageReference Include="MicroCom.CodeGenerator" Version="0.10.3" />
     <!-- Keep in sync with Avalonia.Build.Tasks -->
     <PackageReference Include="Mono.Cecil" Version="0.11.2" />