Update README.md (#363)

README.md

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 *[Azure IoT Hub Toolkit extension](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.azure-iot-toolkit) is now part of [Azure IoT Tools](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.azure-iot-tools) extension pack. We highly recommend installing [Azure IoT Tools](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.azure-iot-tools) extension pack, which makes it easy to discover and interact with Azure IoT Hub that power your IoT Edge and device applications. This extension pack can help you:*
 - *Develop and connect your [Azure IoT Applications](https://azure.microsoft.com/en-us/overview/iot/) to Azure. With this extension, you can interact with an Azure IoT Hub, manage connected devices, and enable distributed tracing for your Azure IoT applications.*
-- *Develop and debug [Certifies Azure IoT Devices](https://catalog.azureiotsolutions.com/alldevices) (including [MXChip IoT DevKit](http://www.mxchip.com/az3166), [ESP32](https://catalog.azureiotsolutions.com/details?title=ESP32_DevKitC&source=all-devices-page), [Raspberry Pi](https://www.adafruit.com/category/288)) to Azure. This extension pack makes it easy to code, build, deploy and debug your IoT applications with popular IoT development boards.*
+- *Develop and debug [Certifies Azure IoT Devices](https://catalog.azureiotsolutions.com/alldevices) (including [MXChip IoT DevKit](https://aka.ms/iot-devkit), [ESP32](https://catalog.azureiotsolutions.com/details?title=ESP32_DevKitC&source=all-devices-page), [Raspberry Pi](https://www.adafruit.com/category/288)) to Azure. This extension pack makes it easy to code, build, deploy and debug your IoT applications with popular IoT development boards.*
 - *Develop and deploy artificial intelligence and your custom logic to [Azure IoT Edge](https://azure.microsoft.com/en-us/services/iot-edge/). This extension pack makes it easy to code, build, deploy, and debug your IoT Edge applications.*
 
 ## Overview