Updated xUnit version

Author: ivaylokenov

samples/ApplicationParts/ApplicationParts.Test/project.json

@@ -8,8 +8,8 @@
     }
   },
   "dependencies": {
-    "dotnet-test-xunit": "1.0.0-*",
-    "XUnit": "2.1.0",
+    "dotnet-test-xunit": "2.2.0-*",
+    "xunit": "2.2.0-*",
     "MyTested.AspNetCore.Mvc": "1.0.0-*",
     "ApplicationParts.Web": "1.0.0-*",
     "ApplicationParts.Controllers": "1.0.0-*",