React to dependencies changes in aspnet/Hosting

aspnet/Hosting@e505ecb

Author: kevinchalet

test/AspNet.Security.OAuth.Validation.Tests/project.json

@@ -8,6 +8,7 @@
     "Microsoft.AspNetCore.TestHost": "1.0.0-rc2-*",
     "Microsoft.Extensions.Caching.Memory": "1.0.0-rc2-*",
     "Microsoft.Extensions.Logging.Debug": "1.0.0-rc2-*",
+    "Newtonsoft.Json": "8.0.3",
     "xunit": "2.1.0"
   },