fix(jira): add asf header

plugins/jira/models/issue_label.go

diff --git a/plugins/jira/models/issue_label.go b/plugins/jira/models/issue_label.go
index 0f9cfbd..6f9e075 100644
--- a/plugins/jira/models/issue_label.go
+++ b/plugins/jira/models/issue_label.go
@@ -1,3 +1,20 @@
+/*
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You 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 models
 
 import (