README auto update [skip ci]

Author: DevExpressExampleBot

Readme.md

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 <!-- default badges list -->
-![](https://img.shields.io/endpoint?url=https://codecentral.devexpress.com/api/v1/VersionRange/128579375/20.1.10%2B)
+![](https://img.shields.io/endpoint?url=https://codecentral.devexpress.com/api/v1/VersionRange/128579375/21.2.1%2B)
 [![](https://img.shields.io/badge/Open_in_DevExpress_Support_Center-FF7200?style=flat-square&logo=DevExpress&logoColor=white)](https://supportcenter.devexpress.com/ticket/details/T400693)
 [![](https://img.shields.io/badge/📖_How_to_use_DevExpress_Examples-e9f6fc?style=flat-square)](https://docs.devexpress.com/GeneralInformation/403183)
 <!-- default badges end -->