Fix image alignment

README.md

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-<center><img src="https://s3.amazonaws.com/ohmyzsh/oh-my-zsh-logo.png" alt="Oh My Zsh"></center>
+<p align="center"><img src="https://s3.amazonaws.com/ohmyzsh/oh-my-zsh-logo.png" alt="Oh My Zsh"></p>
 
 Oh My Zsh is an open source, community-driven framework for managing your [zsh](https://www.zsh.org/) configuration.