Update README.md

Author: Gaurav Bhatt

README.md

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 # Workshop Assignments
 
-[![Join the chat at https://gitter.im/workshop-assignments/Lobby](https://badges.gitter.im/workshop-assignments/Lobby.svg)](https://gitter.im/workshop-assignments/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Join the chat at https://gitter.im/DeepLearn-lab/workshop-assignments](https://badges.gitter.im/DeepLearn-lab/workshop-assignments.svg)](https://gitter.im/DeepLearn-lab/workshop-assignments?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Assignments on cloud computing, machine learning and big data workshop