Update README.md

Author: GrahamCampbell

README.md

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 We present a modern [Bitbucket](https://bitbucket.org/) API 2.0 client, by [Graham Campbell](https://github.com/GrahamCampbell).
 
+![Banner](https://user-images.githubusercontent.com/2829600/71563802-86e2fe80-2a8d-11ea-9f03-1cc0b6517210.png)
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 This is strongly based on [php-github-api](https://github.com/KnpLabs/php-github-api) by [KnpLabs](https://github.com/KnpLabs). With this in mind, we now have **very similar** clients for:
 
 * [GitHub](https://github.com/) - [knplabs/github-api](https://packagist.org/packages/knplabs/github-api) by [KnpLabs](https://github.com/KnpLabs/php-github-api).