Update README.md

- Modify date
- Add nrf52x to description

README.md

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 [![Pico SDK build](https://github.com/nRF24/RF24Network/actions/workflows/build_rp2xxx.yml/badge.svg)](https://github.com/nRF24/RF24Network/actions/workflows/build_rp2xxx.yml)
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-# TMRh20 2014-2023 - Newly Optimized Network Layer for nRF24L01(+) radios
+# TMRh20 2014-2024 - Optimized Network Layer for nRF24L01(+) & nRF52x radios
 Introducing **RF24Network & RF24Mesh v2.0** with some *significant API changes*, adding the use of C++ Templates in order to support a
 range of ESB enabled radios, most recently NRF52x radios.