Update RAK3172 heart color

Author: Oliv4945

README.md

@@ -749,7 +749,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart:  | STM32L073RZ | [AcSIP S76S](https://www.acsip.com.tw) | *2.3.0* |  |
 | :green_heart:  | STM32F072C8<br>STM32F072CB | [Elektor LoRa Node](https://github.com/ElektorLabs/180516-Elektor_LoRa_Node) | *1.8.0* | [More info](https://www.elektormagazine.com/labs/lorawan-node-experimental-platform) |
 | :yellow_heart:  | STM32WLE5JC | [LoRa-E5 mini](https://wiki.seeedstudio.com/LoRa_E5_mini/) | **2.6.0** |  |
-| :green_heart:  | STM32WLE5CC | [RAK3172 Module](https://github.com/RAKWireless/rakwireless-docs/tree/master/docs/Product-Categories/WisDuo/RAK3172-Module) | **2.6.0** |  |
+| :yellow_heart:  | STM32WLE5CC | [RAK3172 Module](https://github.com/RAKWireless/rakwireless-docs/tree/master/docs/Product-Categories/WisDuo/RAK3172-Module) | **2.6.0** |  |
 | :green_heart:  | STM32L151CB | [RAK811 LoRa Tracker](https://www.rakwireless.com/en/) | *1.4.0* | [Wiki](https://github.com/stm32duino/Arduino_Core_STM32/wiki/Connectivities#lora) |
 | :green_heart:  | STM32L051C8 | [RHF76-052](https://lora-alliance.org/lora_products/rhf76-052/) | *1.7.0* | Basic support |