Update README

README.md

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-[txtai](https://github.com/neuml/txtai) builds an AI-powered index over sections of text. txtai supports building text indices to perform similarity searches and create extractive question-answering based systems. txtai also has functionality for zero-shot classification.
+[txtai](https://github.com/neuml/txtai) executes machine-learning workflows to transform data and build AI-powered text indices to perform similarity search.
 
 This repository contains JavaScript bindings for the txtai API. Full txtai functionality is supported.