Ensure SPDX header in all source code

README.md

@@ -104,7 +104,7 @@ Pull requests with mappings and tests for further scripts and languages are more
 
 ## Licence
 
-Copyright 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2023 Lovell Fuller and contributors.
+Copyright 2013 Lovell Fuller and others.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

index.d.ts

@@ -1,3 +1,6 @@
+// Copyright 2013 Lovell Fuller and others.
+// SPDX-License-Identifier: Apache-2.0
+
 type Options = {
   custom?: string[] | { [key: string]: string; };
   lang?: string;

lib/limax.js

@@ -1,3 +1,6 @@
+// Copyright 2013 Lovell Fuller and others.
+// SPDX-License-Identifier: Apache-2.0
+
 'use strict';
 
 const speakingurl = require('speakingurl');

test/unit.js

@@ -1,3 +1,6 @@
+// Copyright 2013 Lovell Fuller and others.
+// SPDX-License-Identifier: Apache-2.0
+
 'use strict';
 
 const ava = require('ava');