add isort to project

tests/test_dictionary.py

@@ -4,6 +4,7 @@
 from io import StringIO
 
 import pytest
+
 from pyrad3.dictionary import Dictionary, ParseError
 
 

tests/test_parse_header.py

@@ -2,11 +2,12 @@
 # SPDX-License-Identifier: MIT OR Apache-2.0
 
 import struct
+from ipaddress import IPv4Address, IPv4Network, IPv6Address, IPv6Network
 
-from ipaddress import IPv4Address, IPv6Address, IPv4Network, IPv6Network
-from pyrad3 import dictionary, utils
 import pytest
 
+from pyrad3 import dictionary, utils
+
 # @pytest.mark.parametrize("header", [
 #     b""])
 # def test_valid_header(header):