Update README.md

Author: mohitalgolia

README.md

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 Algolia Search & Discovery extension for Magento 2
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-![Latest version](https://img.shields.io/badge/latest-3.11.1%20beta-green)
+![Latest version](https://img.shields.io/badge/latest-3.12.0-green)
 ![Magento 2](https://img.shields.io/badge/Magento-2.4.x-orange)
 
 ![PHP](https://img.shields.io/badge/PHP-8.2%2C8.1%2C7.4-blue)