Update README.md

Author: fpistm

README.md

@@ -92,6 +92,9 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
     * [Nucleo F767ZI](http://www.st.com/en/evaluation-tools/nucleo-f767zi.html)
     * [RemRam v1](https://github.com/hasenbanck/remram)
 
+  * STM32L0
+    * [RAK811 LoRa Tracker](https://www.rakwireless.com/en/) (Basic support)
+
   * STM32L4
     * [Nucleo L4R5ZI](http://www.st.com/en/evaluation-tools/nucleo-l4r5zi.html)
     * [Nucleo L4R5ZI-P](http://www.st.com/en/evaluation-tools/nucleo-l4r5zi-p.html)