Update project.json

src/MusicStore.Standalone/project.json

@@ -2,7 +2,7 @@
   "authors": [
     "Microsoft"
   ],
-  "description": "Music store application on ASP.NET 5",
+  "description": "Music store application on ASP.NET Core",
   "version": "1.0.0-*",
   "buildOptions": {
     "compile": {