Fix ESLint header/header error

scripts/check_build_config.js

@@ -1,3 +1,6 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
 const buildConfig = require('../src/common/config/buildConfig');
 
 function validateBuildConfig(config) {

scripts/extract_dict.js

@@ -1,3 +1,7 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
 /* eslint-disable no-process-exit */
 
 const {spawn} = require('child_process');

scripts/manipulate_windows_zip.js

@@ -1,3 +1,6 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
 'use strict';
 
 const spawnSync = require('child_process').spawnSync;

scripts/watch_main_and_preload.js

@@ -1,3 +1,6 @@
+// Copyright (c) 2015-2016 Yuya Ochiai
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
 const webpack = require('webpack');
 const electron = require('electron-connect').server.create({path: 'src'});