Improve the diff in cluster resources.

- Use the branch of pretty with this feature fixed:
  https://github.com/kr/pretty/pull/42
- Add the Limit to the resources declaration to avoid dummy
  differences between statefulsets (where both Resource structures
  are empty, but in one case the fields are not mentioned, while
  in another they are assigned to empty values).

pkg/cluster/k8sres.go

@@ -115,6 +115,7 @@ bootstrap:
 		ImagePullPolicy: v1.PullAlways,
 		Resources: v1.ResourceRequirements{
 			Requests: *resourceList,
+			Limits: v1.ResourceList{},
 		},
 		Ports: []v1.ContainerPort{
 			{

pkg/util/util.go

@@ -7,7 +7,7 @@ import (
 	"math/rand"
 	"time"
 
-	"github.com/kr/pretty"
+	"github.com/motomux/pretty"
 
 	"github.bus.zalan.do/acid/postgres-operator/pkg/spec"
 	"k8s.io/client-go/pkg/api/v1"