add spaces before and after logo

README.md

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 | [![Build status - develop](https://badge.buildkite.com/0c47452f3ea619d3217d388e0de522b218db28c3e161887a9a.svg?branch=develop)](https://buildkite.com/o-1-labs-2/mina-end-to-end-nightlies) | [![Build status - compatible](https://badge.buildkite.com/0c47452f3ea619d3217d388e0de522b218db28c3e161887a9a.svg?branch=compatible)](https://buildkite.com/o-1-labs-2/mina-end-to-end-nightlies) | [![Build status - master](https://badge.buildkite.com/0c47452f3ea619d3217d388e0de522b218db28c3e161887a9a.svg?branch=master)](https://buildkite.com/o-1-labs-2/mina-end-to-end-nightlies)
 
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 <a href="https://minaprotocol.com">
   <img src="https://minaprotocol.com/wp-content/themes/minaprotocol/img/footerLogo.svg" width="350" alt="Mina logo" />
 </a>
 
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 Mina is the first cryptocurrency with a lightweight, constant-sized blockchain. This is the main source code repository for the Mina project and contains code for the OCaml protocol implementation, the [Mina Protocol website](https://minaprotocol.com), and wallet. Enjoy!