Update README.md (#40)

Signed-off-by: Zeibura Kathau <zeibura.kathau@broadcom.com>

Author: zeibura

README.md

@@ -24,6 +24,7 @@ With the Code4z extension pack you can:
 - Issue TSO and MVS commands.
 
 ## What’s New
+* 2021-09-17 - [Debugger for Mainframe](https://marketplace.visualstudio.com/items?itemName=broadcomMFD.debugger-for-mainframe) version 1.15.1, see [Changelog](https://marketplace.visualstudio.com/items/broadcomMFD.debugger-for-mainframe/changelog).
 * 2021-09-10 - [COBOL Language Support](https://marketplace.visualstudio.com/items?itemName=broadcomMFD.cobol-language-support) version 0.21.0, see [Changelog](https://marketplace.visualstudio.com/items/broadcomMFD.cobol-language-support/changelog).
 * 2021-09-07 - [Explorer for Endevor](https://marketplace.visualstudio.com/items?itemName=broadcomMFD.explorer-for-endevor) version 0.13.1, see [Changelog](https://marketplace.visualstudio.com/items/broadcomMFD.explorer-for-endevor/changelog).
 * 2021-08-24 - [Zowe Explorer](https://marketplace.visualstudio.com/items?itemName=Zowe.vscode-extension-for-zowe) version 1.18.1, see [Changelog](https://marketplace.visualstudio.com/items/Zowe.vscode-extension-for-zowe/changelog).