Update dependency versions. Run go mod tidy. (#65)

go.mod

@@ -4,7 +4,7 @@ require (
 	github.com/census-instrumentation/opencensus-proto v0.2.0 // this is to match the version used in census-instrumentation/opencensus-service
 	github.com/golang/protobuf v1.3.1
 	github.com/grpc-ecosystem/grpc-gateway v1.8.5 // indirect
-	go.opencensus.io v0.20.2
-	google.golang.org/api v0.3.1
-	google.golang.org/grpc v1.19.1
+	go.opencensus.io v0.21.0
+	google.golang.org/api v0.4.0
+	google.golang.org/grpc v1.20.1
 )

go.sum

@@ -1,87 +1,39 @@
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@@ -94,37 +46,26 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
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