Update README.md

Author: CuriousDima

README.md

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 It is freely available. Go ahead and give it a try: https://t.me/PardonMyEnglishBot.
 
 Pardon My English is designed to assist non-native English speakers by transforming semantically incorrect or awkwardly phrased English text into grammatically accurate and fluent English. Users simply input their original text, and the bot efficiently processes and returns a polished version, enhancing clarity and coherence. Ideal for learners of English, professionals, and anyone looking to improve their written communication.
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+# Changelog
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+- \[2024-04-24\] We've transitioned to using Llama3-70B for all existing and new users, and have seen significant improvements in quality without any degradation in inference speed, thanks to the capabilities of [Groq](https://groq.com/).