docs(readme): add Greenkeeper badge

https://greenkeeper.io/
arvitaly · Mar 13, 2017 · 7068764 · 7068764
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 # fixture2
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+[![Greenkeeper badge](https://badges.greenkeeper.io/arvitaly/fixture2.svg)](https://greenkeeper.io/)
 Microlib for create fixtures for unit-testing
 
 [![npm version](https://badge.fury.io/js/fixture2.svg)](https://badge.fury.io/js/fixture2)