Avoid packing sample server, fixed undefined exception

Author: david-driscoll

sample/SampleServer/SampleServer.csproj

@@ -2,6 +2,7 @@
 
     <PropertyGroup>
         <OutputType>Exe</OutputType>
+        <IsPackable>false</IsPackable>
         <TargetFramework>netcoreapp2.0</TargetFramework>
         <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
     </PropertyGroup>

src/Server/SupportedCapabilities.cs

@@ -10,7 +10,7 @@ namespace OmniSharp.Extensions.LanguageServer.Server
 {
     class SupportedCapabilities : ISupportedCapabilities
     {
-        private static readonly MethodInfo SetCapabilityInnerMethod = typeof(LspHandlerDescriptorHelpers)
+        private static readonly MethodInfo SetCapabilityInnerMethod = typeof(SupportedCapabilities)
             .GetTypeInfo()
             .GetMethod(nameof(SetCapabilityInner), BindingFlags.NonPublic | BindingFlags.Static);