Use an official version of Prometheus instead of master. (#6)

* Use an official version of Prometheus instead of master.

* Remove new line.

go.mod

@@ -1,6 +1,6 @@
 module contrib.go.opencensus.io/exporter/prometheus
 
 require (
-	github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 // TODO: change the version to v0.9.2 once oc-go version is updated.
+	github.com/prometheus/client_golang v0.9.2
 	go.opencensus.io v0.21.0
 )

go.sum

@@ -1,15 +1,8 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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@@ -18,52 +11,34 @@ github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
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 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -73,7 +48,4 @@ google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
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