Update go dependencies

vendor/google.golang.org/api/doc.go

@@ -0,0 +1,23 @@
+// Copyright 2019 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package api is the root of the packages used to access Google Cloud
+// Services. See https://godoc.org/google.golang.org/api for a full list of
+// sub-packages.
+//
+//
+// Client Options
+//
+// All clients in sub-packages are configurable via client options. These
+// options are described here: https://godoc.org/google.golang.org/api/option.
+//
+//
+// Authentication and Authorization
+//
+// All the clients in sub-packages support authentication via Google
+// Application Default Credentials (see
+// https://cloud.google.com/docs/authentication/production), or by providing a
+// JSON key file for a Service Account. See the authentication examples in this
+// package for details.
+package api