Update changelog

Author: nicolas-grekas

README.md

@@ -4,7 +4,7 @@ Symfony Polyfill / Uuid
 This component provides `uuid_*` functions to users who run PHP versions without the uuid extension.
 
 More information can be found in the
-[main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).
+[main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).
 
 License
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