Print map in readable format when display format is set to text (#86)

cmd/output.go

diff --git a/cmd/output.go b/cmd/output.go
index e3815e4..d18458d 100644
--- a/cmd/output.go
+++ b/cmd/output.go
@@ -35,7 +35,7 @@
 		return ""
 	}
 	if reflect.TypeOf(value).Kind() == reflect.Map || reflect.TypeOf(value).Kind() == reflect.Slice {
-		jsonStr, err := json.Marshal(value)
+		jsonStr, err := json.MarshalIndent(value, "", "")
 		if err == nil {
 			value = string(jsonStr)
 		}