Merge pull request #4540 from OmniSharp/virtualWorkspaces-capability

Update package.json to advertise that we don't support virtualWorkspaces

Author: JoeRobich

package.json

@@ -28,6 +28,9 @@
     ".NET Core",
     "dotnet"
   ],
+  "capabilities": {
+    "virtualWorkspaces": false
+  },
   "defaults": {
     "omniSharp": "1.37.8",
     "razor": "6.0.0-alpha.1.21201.19"
@@ -3696,4 +3699,4 @@
       ]
     }
   }
-}
+}