moved serial clients to own package

test/test_protocol.py

@@ -5,7 +5,7 @@ import unittest
 from dsmr_parser import obis_references as obis
 from dsmr_parser import telegram_specifications
 from dsmr_parser.parsers import TelegramParserV2_2
-from dsmr_parser.protocol import DSMRProtocol
+from dsmr_parser.clients.protocol import DSMRProtocol
 
 
 TELEGRAM_V2_2 = (

test/test_telegram_buffer.py

@@ -1,6 +1,6 @@
 import unittest
 
-from dsmr_parser.serial import TelegramBuffer
+from dsmr_parser.clients.telegram_buffer import TelegramBuffer
 from test.example_telegrams import TELEGRAM_V2_2, TELEGRAM_V4_2