Update README link to ISO 18425:2023

jleclanche · Nov 21, 2024 · 9838cfb · 9838cfb
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@@ -28,7 +28,7 @@ iso18245.InvalidMCC: 999999
 ## External links
 
 - [Wikipedia: ISO 18245](https://en.wikipedia.org/wiki/ISO_18245)
-- [ISO Standard 18245:2003](https://www.iso.org/standard/33365.html)
+- [ISO Standard 18245:2023](https://www.iso.org/standard/79450.html)
 - [AFNOR: ISO 18245](http://portailgroupe.afnor.fr/public_espacenormalisation/ISOTC68SC7/ISO%2018245.html)
 - [Stripe MCC List](https://stripe.com/docs/issuing/categories)
 - [USDA MCC List (incl. private MCCs)](https://www.dm.usda.gov/procurement/card/card_x/mcc.pdf)