Bump k8s.io/client-go from 0.18.3 to 0.20.0

Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.18.3 to 0.20.0.
- [Release notes](https://github.com/kubernetes/client-go/releases)
- [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md)
- [Commits](kubernetes/client-go@v0.18.3...v0.20.0)

---
updated-dependencies:
- dependency-name: k8s.io/client-go
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: go.mod

@@ -8,16 +8,16 @@ require (
 	github.com/containernetworking/plugins v0.8.6
 	github.com/go-logfmt/logfmt v0.5.0
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/lunixbochs/struc v0.0.0-20200707160740-784aaebc1d40
+	github.com/lunixbochs/struc v0.0.0-20200707160740-784aaebc1d40 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/safchain/ethtool v0.0.0-20200804214954-8f958a28363a // indirect
 	github.com/sirupsen/logrus v1.7.0
 	github.com/stretchr/testify v1.6.1
 	github.com/vishvananda/netlink v1.1.0
-	golang.org/x/sys v0.0.0-20201005065044-765f4ea38db3
+	golang.org/x/sys v0.0.0-20201112073958-5cba982894dd
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
-	k8s.io/api v0.18.3
-	k8s.io/apimachinery v0.18.3
-	k8s.io/client-go v0.18.3
+	k8s.io/api v0.20.0
+	k8s.io/apimachinery v0.20.0
+	k8s.io/client-go v0.20.0
 )