Add copyright notice to eslint file

Author: binarymist

.eslintrc.js

@@ -1,3 +1,12 @@
+// Copyright (C) 2017-2022 BinaryMist Limited. All rights reserved.
+
+// Use of this software is governed by the Business Source License
+// included in the file /licenses/bsl.md
+
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0
+
 module.exports = {
   extends: 'airbnb-base',
   rules: {

LEGALNOTICE.md

@@ -19,4 +19,5 @@ For other licenses [contact us](https://purpleteam-labs.com/contact/).
 THIRD-PARTY SOFTWARE LICENSES
 -----------------------------
 
-A list of third party sources can be found [here](https://purpleteam-labs.com/doc/third-party-sources/)
+A list of third party sources can be found [here](https://purpleteam-labs.com/doc/third-party-sources/).
+