Update go dependencies

vendor/sigs.k8s.io/controller-runtime/pkg/client/doc.go

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+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package client contains functionality for interacting with Kubernetes API
+// servers.
+//
+// Clients
+//
+// Clients are split into two interfaces -- Readers and Writers.   Readers
+// get and list, while writers create, update, and delete.
+//
+// The New function can be used to create a new client that talks directly
+// to the API server.
+//
+// A common pattern in Kubernetes to read from a cache and write to the API
+// server.  This pattern is covered by the DelegatingClient type, which can
+// be used to have a client whose Reader is different from the Writer.
+//
+// Options
+//
+// Many client operations in Kubernetes support options.  These options are
+// represented as variadic arguments at the end of a given method call.
+// For instance, to use a label selector on list, you can call
+//  err := someReader.List(context.Background(), &podList, client.MatchingLabels{"somelabel": "someval"})
+//
+// Indexing
+//
+// Indexes may be added to caches using a FieldIndexer.  This allows you to easily
+// and efficiently look up objects with certain properties.  You can then make
+// use of the index by specifying a field selector on calls to List on the Reader
+// corresponding to the given Cache.
+//
+// For instance, a Secret controller might have an index on the
+// `.spec.volumes.secret.secretName` field in Pod objects, so that it could
+// easily look up all pods that reference a given secret.
+package client