Add code-of-conduct badge to README

README.md

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 Queue
 =====
 
-[![Build Status](https://travis-ci.org/eapache/queue.svg)](https://travis-ci.org/eapache/queue)
 [![GoDoc](https://godoc.org/github.com/eapache/queue?status.png)](https://godoc.org/github.com/eapache/queue)
+[![Build Status](https://travis-ci.org/eapache/queue.svg)](https://travis-ci.org/eapache/queue)
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 A fast Golang queue using a ring-buffer, based on the version suggested by Dariusz Górecki.
 Using this instead of other, simpler, queue implementations (slice+append or linked list) provides