docs(readme): add Greenkeeper badge (#2)

opencomponents · May 12, 2017 · 467ffc4 · 467ffc4
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 # oc-registry-graphql-express-middleware
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/opencomponents/oc-registry-graphql-express-middleware.svg)](https://greenkeeper.io/)
+
 OpenComponent Registry GraphQL Express middleware.
 
 ## How to install