Update README.md

Author: jason-fox

README.md

@@ -16,7 +16,7 @@ The tutorial uses [cUrl](https://ec.haxx.se/) commands throughout, but is also a
 [Postman documentation](https://fiware.github.io/tutorials.IoT-Agent/)
 
 [![Run in Postman](https://run.pstmn.io/button.svg)](https://app.getpostman.com/run-collection/acfd27a941ed57a0cae5)
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/FIWARE/tutorials.IoT-Agent-over-IOTA/tree/NGSI-v2)
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/FIWARE/tutorials.IoT-Agent-over-MQTT/tree/NGSI-v2)
 
 -   このチュートリアルは[日本語](README.ja.md)でもご覧いただけます。