Update README.md

Author: yisz

README.md

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-  <p>Open-Source Evaluation for LLM Applications</p>
+  <p>Production-Grade Evaluation for LLM-Powered Applications</p>
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 ## Overview
 
-`continuous-eval` is an open-source package created for granular and holistic evaluation of GenAI application pipelines. 
+`continuous-eval` is an open-source package created for granular and rigorous evaluation of LLM-powered application. 
 
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