A godoc badge because I am vain. :-)

README.md

@@ -1,5 +1,7 @@
 # Queue data structure for Go
 
+[![GoDoc](https://godoc.org/github.com/phf/go-queue/queue?status.png)](http://godoc.org/github.com/phf/go-queue/queue)
+
 See http://godoc.org/github.com/phf/go-queue/queue for the documentation.
 
 ## Background