Update vendor (github.com/mattermost)

vendor/github.com/mattermost/mattermost-server/model/data_retention_policy.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type DataRetentionPolicy struct {
+	MessageDeletionEnabled bool  `json:"message_deletion_enabled"`
+	FileDeletionEnabled    bool  `json:"file_deletion_enabled"`
+	MessageRetentionCutoff int64 `json:"message_retention_cutoff"`
+	FileRetentionCutoff    int64 `json:"file_retention_cutoff"`
+}
+
+func (me *DataRetentionPolicy) ToJson() string {
+	b, _ := json.Marshal(me)
+	return string(b)
+}
+
+func DataRetentionPolicyFromJson(data io.Reader) *DataRetentionPolicy {
+	var me *DataRetentionPolicy
+	json.NewDecoder(data).Decode(&me)
+	return me
+}