Use mattermost v5 module (#1192)

vendor/github.com/mattermost/mattermost-server/v5/model/security_bulletin.go

@@ -0,0 +1,41 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type SecurityBulletin struct {
+	Id               string `json:"id"`
+	AppliesToVersion string `json:"applies_to_version"`
+}
+
+type SecurityBulletins []SecurityBulletin
+
+func (me *SecurityBulletin) ToJson() string {
+	b, _ := json.Marshal(me)
+	return string(b)
+}
+
+func SecurityBulletinFromJson(data io.Reader) *SecurityBulletin {
+	var o *SecurityBulletin
+	json.NewDecoder(data).Decode(&o)
+	return o
+}
+
+func (me SecurityBulletins) ToJson() string {
+	if b, err := json.Marshal(me); err != nil {
+		return "[]"
+	} else {
+		return string(b)
+	}
+}
+
+func SecurityBulletinsFromJson(data io.Reader) SecurityBulletins {
+	var o SecurityBulletins
+	json.NewDecoder(data).Decode(&o)
+	return o
+}