update dependencies (#1019)

Co-authored-by: Felix Kunde <felix.kunde@zalando.de>

go.mod

@@ -3,21 +3,18 @@ module github.com/zalando/postgres-operator
 go 1.14
 
 require (
-	github.com/aws/aws-sdk-go v1.29.33
-	github.com/emicklei/go-restful v2.9.6+incompatible // indirect
-	github.com/evanphx/json-patch v4.5.0+incompatible // indirect
-	github.com/googleapis/gnostic v0.3.0 // indirect
-	github.com/lib/pq v1.3.0
+	github.com/aws/aws-sdk-go v1.32.2
+	github.com/lib/pq v1.7.0
 	github.com/motomux/pretty v0.0.0-20161209205251-b2aad2c9a95d
-	github.com/r3labs/diff v0.0.0-20191120142937-b4ed99a31f5a
-	github.com/sirupsen/logrus v1.5.0
-	github.com/stretchr/testify v1.4.0
-	golang.org/x/tools v0.0.0-20200426102838-f3a5411a4c3b // indirect
+	github.com/r3labs/diff v1.1.0
+	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.5.1
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/tools v0.0.0-20200615222825-6aa8f57aacd9 // indirect
 	gopkg.in/yaml.v2 v2.2.8
-	k8s.io/api v0.18.2
-	k8s.io/apiextensions-apiserver v0.18.2
-	k8s.io/apimachinery v0.18.2
-	k8s.io/client-go v11.0.0+incompatible
-	k8s.io/code-generator v0.18.2
-	sigs.k8s.io/kind v0.5.1 // indirect
+	k8s.io/api v0.18.3
+	k8s.io/apiextensions-apiserver v0.18.3
+	k8s.io/apimachinery v0.18.3
+	k8s.io/client-go v0.18.3
+	k8s.io/code-generator v0.18.3
 )