Update vendor

vendor/github.com/google/go-containerregistry/pkg/legacy/config.go

@@ -0,0 +1,33 @@
+// Copyright 2019 Google LLC All Rights Reserved.
+//
+// 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 legacy
+
+import (
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+// LayerConfigFile is the configuration file that holds the metadata describing
+// a v1 layer. See:
+// https://github.com/moby/moby/blob/master/image/spec/v1.md
+type LayerConfigFile struct {
+	v1.ConfigFile
+
+	ContainerConfig v1.Config `json:"container_config,omitempty"`
+
+	ID        string `json:"id,omitempty"`
+	Parent    string `json:"parent,omitempty"`
+	Throwaway bool   `json:"throwaway,omitempty"`
+	Comment   string `json:"comment,omitempty"`
+}