Bump go.opencensus.io from 0.22.3 to 0.22.4

Bumps [go.opencensus.io](https://github.com/census-instrumentation/opencensus-go) from 0.22.3 to 0.22.4.
- [Release notes](https://github.com/census-instrumentation/opencensus-go/releases)
- [Commits](census-instrumentation/opencensus-go@v0.22.3...v0.22.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -54,7 +54,7 @@ require (
 	github.com/urfave/cli v1.22.1 // indirect
 	go.etcd.io/bbolt v1.3.4 // indirect
 	go.etcd.io/etcd v0.0.0-20200513171258-e048e166ab9c
-	go.opencensus.io v0.22.3
+	go.opencensus.io v0.22.4
 	go.uber.org/multierr v1.4.0 // indirect
 	go.uber.org/zap v1.13.0 // indirect
 	golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4

go.sum

@@ -387,6 +387,8 @@ go.opencensus.io v0.22.1/go.mod h1:Ap50jQcDJrx6rB6VgeeFPtuPIf3wMRvRfrfYDO6+BmA=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3 h1:8sGtKOrtQqkN1bp2AtX+misvLIlOmsEsNd+9NIcPEm8=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.4 h1:LYy1Hy3MJdrCdMwwzxA/dRok4ejH+RwNGbuoD9fCjto=
+go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.5.0 h1:OI5t8sDa1Or+q8AeE+yKeB/SDYioSHAgcVljj9JIETY=