Add DOI

README.md

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 # BBopt
 
 [![Join the chat at https://gitter.im/evhub/bbopt](https://badges.gitter.im/evhub/bbopt.svg)](https://gitter.im/evhub/bbopt?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![DOI](https://zenodo.org/badge/102327504.svg)](https://zenodo.org/badge/latestdoi/102327504)
 
 BBopt aims to provide the easiest hyperparameter optimization you'll ever do. Think of BBopt like [Keras](https://keras.io/) for black box optimization: one universal interface for working with any black box optimization backend.