Bump k8s.io/apimachinery from 0.15.7 to 0.16.13

Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.15.7 to 0.16.13.
- [Commits](kubernetes/apimachinery@v0.15.7...v0.16.13)

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

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

go.mod

@@ -9,13 +9,10 @@ replace github.com/Sirupsen/logrus => github.com/sirupsen/logrus v1.3.0
 require (
 	github.com/Comcast/kuberhealthy/v2 v2.2.0
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/kr/pretty v0.1.0 // indirect
 	github.com/sirupsen/logrus v1.4.0
-	github.com/spf13/pflag v1.0.3 // indirect
 	github.com/stretchr/testify v1.5.1 // indirect
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	k8s.io/api v0.0.0-20190819141258-3544db3b9e44
-	k8s.io/apimachinery v0.15.7
+	k8s.io/apimachinery v0.16.13
 	k8s.io/client-go v0.0.0-20190819141724-e14f31a72a77
 )