Update README.md

Author: tomFlidr

README.md

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 # Example - Hello World - TypeScript
 
 [![Latest Stable Version](https://img.shields.io/badge/Stable-v2.0.0-brightgreen.svg?style=plastic)](https://github.com/web-dev-server/example-helloworld/releases)
+[![Min. TypeScript Version](https://img.shields.io/badge/TypeScript-v3.7-brightgreen.svg?style=plastic)](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html)
 [![License](https://img.shields.io/badge/Licence-BSD-brightgreen.svg?style=plastic)](https://github.com/web-dev-server/example-helloworld/blob/master/LICENCE.md)
 
 Hallo world example with static and dynamic content in TypeScript.