Removed codecov badge

Author: bedogni@unimore.it

README.md

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 Advanced split computing implementation for TinyML on IoT devices with intelligent offloading, variance detection, and resilient client-server communication.
 
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+![Unit Tests](https://github.com/UBICO/SCIoT/actions/workflows/codecov.yml/badge.svg) [![Powered by UBICO](https://img.shields.io/badge/powered%20by-UBICO-orange.svg?style=flat&colorA=E1523D&colorB=007D8A)]()  
 
 ## Overview