docs(readme): add Greenkeeper badge (#10)

https://greenkeeper.io/
haraka · Jan 25, 2017 · 18b47c9 · 18b47c9
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 # haraka-plugin-log-reader
 
+[![Greenkeeper badge](https://badges.greenkeeper.io/haraka/haraka-plugin-log-reader.svg)](https://greenkeeper.io/)
+
 extracts matching log entries from the haraka log file