Update README.md

Author: sauravhathi

README.md

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 # Coursera Automation Extension 
-![Version](https://img.shields.io/badge/version-1.3.13-blue) 
+![Version](https://img.shields.io/badge/version-1.4.0-blue) 
 ![License](https://img.shields.io/badge/license-MIT-green) 
 ![Platform](https://img.shields.io/badge/platform-Chrome-blue)