Fix demo link in README.md for reference integrations. (#49)

Author: muneebahmed10

README.md

@@ -59,7 +59,7 @@ Please refer to the demos of the AWS IoT Device Shadow library in the following
 | :-: | :-: | :-: |
 | POSIX | [AWS IoT Device SDK for Embedded C](https://github.com/aws/aws-iot-device-sdk-embedded-C/tree/master/demos/shadow/shadow_demo_main) | POSIX sockets for TCP/IP and OpenSSL for TLS stack
 | FreeRTOS | [FreeRTOS/FreeRTOS](https://github.com/FreeRTOS/FreeRTOS/tree/master/FreeRTOS-Plus/Demo/AWS/Device_Shadow_Windows_Simulator) | FreeRTOS+TCP for TCP/IP and mbedTLS for TLS stack |
-| FreeRTOS | [FreeRTOS AWS Reference Integrations](https://github.com/aws/amazon-freertos/tree/master/demos/device_shadow_for_aws) | Based on Secure Sockets Abstraction |
+| FreeRTOS | [FreeRTOS AWS Reference Integrations](https://github.com/aws/amazon-freertos/tree/master/demos/device_shadow_for_aws_iot_embedded_sdk) | Based on Secure Sockets Abstraction |
 
 ## Generating documentation