Update README.md

Author: parulnith

README.md

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-# Building-a-Simple-Chatbot-in-Python-using-NLTK
+# Building a Simple Chatbot in Python (using NLTK)
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+Gartner estimates that by 2020, chatbots will be handling 85 percent of customer-service interactions; they are already handling about 30 percent of transactions now.
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+This is the Repository linked with my published article on Medium with the same title. Please find the link to the article [here](https://medium.com/analytics-vidhya/building-a-simple-chatbot-in-python-using-nltk-7c8c8215ac6e)