Add Cat storage transformer

pkg/transformers/storage_diffs/shared/decoder.go

@@ -27,6 +27,8 @@ func Decode(row StorageDiffRow, metadata StorageValueMetadata) (interface{}, err
 		return decodeUint256(row.StorageValue.Bytes()), nil
 	case Address:
 		return decodeAddress(row.StorageValue.Bytes()), nil
+	case Bytes32:
+		return row.StorageValue.Hex(), nil
 	default:
 		return nil, ErrTypeNotFound{}
 	}

pkg/transformers/storage_diffs/shared/value.go

@@ -27,8 +27,9 @@ const (
 type Key string
 
 const (
-	Ilk Key = "ilk"
-	Guy Key = "guy"
+	Ilk  Key = "ilk"
+	Guy  Key = "guy"
+	Flip Key = "flip"
 )
 
 type StorageValueMetadata struct {