Update vendor (github.com/mattermost)

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

@@ -0,0 +1,25 @@
+// Copyright (c) 2018-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type EmojiSearch struct {
+	Term       string `json:"term"`
+	PrefixOnly bool   `json:"prefix_only"`
+}
+
+func (es *EmojiSearch) ToJson() string {
+	b, _ := json.Marshal(es)
+	return string(b)
+}
+
+func EmojiSearchFromJson(data io.Reader) *EmojiSearch {
+	var es *EmojiSearch
+	json.NewDecoder(data).Decode(&es)
+	return es
+}