Bump k8s.io/apimachinery from 0.18.8 to 0.20.1

Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.18.8 to 0.20.1.
- [Release notes](https://github.com/kubernetes/apimachinery/releases)
- [Commits](kubernetes/apimachinery@v0.18.8...v0.20.1)

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

go.mod

@@ -11,10 +11,10 @@ require (
 	github.com/onsi/gomega v1.10.3
 	github.com/stretchr/testify v1.6.1
 	github.com/thoas/go-funk v0.7.0
-	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
-	k8s.io/api v0.18.8
-	k8s.io/apimachinery v0.18.8
-	k8s.io/client-go v0.18.8
-	k8s.io/utils v0.0.0-20200603063816-c1c6865ac451
+	golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6
+	k8s.io/api v0.19.2
+	k8s.io/apimachinery v0.20.1
+	k8s.io/client-go v0.19.2
+	k8s.io/utils v0.0.0-20200912215256-4140de9c8800
 	sigs.k8s.io/controller-runtime v0.7.0
 )