Update README.md

Author: jason-fox

README.md

@@ -46,6 +46,7 @@ git checkout NGSI-LD
 ```
 
 | [![NGSI LD](https://img.shields.io/badge/NGSI-LD-d6604d.svg)](https://www.etsi.org/deliver/etsi_gs/CIM/001_099/009/01.08.01_60/gs_cim009v010801p.pdf) | :books: [Documentation](https://github.com/FIWARE/tutorials.IoT-Agent-JSON/tree/NGSI-LD) | <img  src="https://cdn.jsdelivr.net/npm/simple-icons@v3/icons/postman.svg" height="15" width="15"> [Postman Collection](https://fiware.github.io/tutorials.IoT-Agent-JSON/ngsi-ld.html) |
+| --- | --- | --- |
 
 ---