Merge pull request #3369 from cesanta/novlean-patch-1

Remove MQTT article link from README

Author: novlean

README.md

@@ -211,6 +211,7 @@ Technical guides and deep dives into embedded web servers, WebUI integration and
 - [Web dashboard on Zephyr RTOS](https://mongoose.ws/articles/web-dashboard-on-zephyr-rtos/)
 - [Limiting TCP/IP RAM usage on STM32](https://mongoose.ws/articles/limiting-tcpip-ram-usage-on-stm32/)
 - [STM32 Ethernet explained](https://mongoose.ws/articles/stm32-ethernet-explained/)
+- [MQTT on a Microcontroller](https://mongoose.ws/articles/mqtt-on-a-microcontroller/)
 
 
 ## Contributions