docs(readme): add Greenkeeper badge

https://greenkeeper.io/
haraka · Jan 26, 2017 · ccd2059 · ccd2059
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 # haraka-plugin-redis
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/haraka/haraka-plugin-redis.svg)](https://greenkeeper.io/)
+
 Connects to a redis instance. By default it stores a `redis`
 connection handle at `server.notes.redis`. See below to get a custom DB handle
 attached to another database.