add 'use strict' to lib/punycode.js
in @21130c7d, all the js files in lib/ had 'use strict' added. Just happened to notice that lib/punycode.js does not. So, I added it.
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in @21130c7d, all the js files in lib/ had 'use strict' added. Just happened to notice that lib/punycode.js does not. So, I added it.