go back to align center in readme logo

Author: 7bitcoder

README.md

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 [![CI](https://github.com/7bitcoder/7bitConf/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/7bitcoder/7bitConf/actions/workflows/CI.yml) ![Conan Center](https://img.shields.io/conan/v/7bitconf)
 
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   <span>
     <img src="7bitConf-logo.svg" alt="logo" width="500" height="auto" />
     <p> C++17 configuration provider library! </p>