Update README to explain firmware versions

Seeed-Studio · Mar 4, 2021 · 6e87101 · 6e87101
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 # Seeed_Arduino_mbedtls  [![Build Status](https://travis-ci.com/Seeed-Studio/Seeed_Arduino_mbedtls.svg?branch=master)](https://travis-ci.com/Seeed-Studio/Seeed_Arduino_mbedtls)
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+Please note that you need to use the following release versions for the respective firmware structures:
+
+- v2.0.1 - AT firmware structure
+- v3.0.1 and above - eRPC firmware structure