update .net core solution

src/Emby.Server/project.json

@@ -6,6 +6,7 @@
 
   "dependencies": {
     "Emby.Common.Implementations": "1.0.0-*",
+    "Emby.Server.Core": "1.0.0-*",
     "Microsoft.NETCore.App": {
       "type": "platform",
       "version": "1.0.1"