Fix: Don't delete predefined deployment strategies (#1081)

resources/appconfig-deploymentstrategies.go

@@ -1,6 +1,9 @@
 package resources
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/appconfig"
@@ -39,6 +42,13 @@ func ListAppConfigDeploymentStrategies(sess *session.Session) ([]Resource, error
 	return resources, nil
 }
 
+func (f *AppConfigDeploymentStrategy) Filter() error {
+	if strings.HasPrefix(*f.name, "AppConfig.") {
+		return fmt.Errorf("cannot delete predefined Deployment Strategy")
+	}
+	return nil
+}
+
 func (f *AppConfigDeploymentStrategy) Remove() error {
 	_, err := f.svc.DeleteDeploymentStrategy(&appconfig.DeleteDeploymentStrategyInput{
 		DeploymentStrategyId: f.id,