Update README.md.

yiisoft · Sep 29, 2023 · 2333f89 · 2333f89
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@@ -17,10 +17,13 @@ Documentation is at [docs/guide/README.md](docs/guide/README.md).
 [![Latest Stable Version](https://poser.pugx.org/yiisoft/yii2-elasticsearch/v/stable.png)](https://packagist.org/packages/yiisoft/yii2-elasticsearch)
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 Requirements
 ------------
 
+- PHP 7.3 or higher.
+
 Depending on the version of Elasticsearch you are using you need a different version of this extension.
 
 - For Elasticsearch 1.6.0 to 1.7.6 use extension version 2.0.x