update Google.Apis.Auth to 1.16.0 for project.json projects

src/csharp/Grpc.Auth/project.json

 {
-  "version": "1.0.1-pre1",
+  "version": "1.1.0-dev",
   "title": "gRPC C# Auth",
   "authors": [ "Google Inc." ],
   "copyright": "Copyright 2015, Google Inc.",
@@ -22,8 +22,8 @@
     }
   },
   "dependencies": {
-    "Grpc.Core": "1.0.1-pre1",
-    "Google.Apis.Auth": "1.15.0"
+    "Grpc.Core": "1.1.0-dev",
+    "Google.Apis.Auth": "1.16.0"
   },
   "frameworks": {
     "net45": { },

templates/src/csharp/Grpc.Auth/project.json.template

@@ -25,7 +25,7 @@
     },
     "dependencies": {
       "Grpc.Core": "${settings.csharp_version}",
-      "Google.Apis.Auth": "1.15.0"
+      "Google.Apis.Auth": "1.16.0"
     },
     "frameworks": {
       "net45": { },