Update README.md

Author: v-jaswel

Vision/ComputerVision/README.md

@@ -11,7 +11,7 @@ This sample code uses image classification and object detection on an image with
 ## Getting Started
 
 ### Prerequisites
-- If you don't have a Microsoft Azure subscription you can get a FREE trial account [here](http://go.microsoft.com/fwlink/?LinkId=330212).
+- If you don't have a Microsoft Azure subscription you can visit [the Microsoft Cognitive Services Web site](https://azure.microsoft.com/free/cognitive-services/), create a new Azure account, and try Cognitive Services for free.
 - Get an [Azure Computer Vision](https://azure.microsoft.com/en-us/services/cognitive-services/computer-vision/) account to get your subscription key and endpoint.
 - Add COMPUTER_VISION_SUBSCRIPTION_KEY and COMPUTER_VISION_ENDPOINT to your environment variables with your key and endpoint as values.