Augmentation vers version 3.3.0

vendor/symfony/polyfill-util/README.md

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+Symfony Polyfill / Util
+=======================
+
+This component provides binary-safe string functions, using the
+[mbstring](https://php.net/mbstring) extension when available.
+
+More information can be found in the
+[main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).
+
+License
+=======
+
+This library is released under the [MIT license](LICENSE).