Reformat code; add backports.zoneinfo for Python version < 3.9.

pyproject.toml

@@ -13,6 +13,7 @@ description = "Logging/encoding/decoding using CLP's IR stream format"
 readme = "README.md"
 requires-python = ">=3.6"
 dependencies = [
+    "backports.zoneinfo >= 0.2.1; python_version<'3.9'",
     "clp-ffi-py >= 0.0.9",
     "typing-extensions >= 3.7.4",
 	"tzlocal >= 5.2",

src/clp_logging/handlers.py

@@ -4,7 +4,6 @@
 import sys
 import time
 from abc import ABCMeta, abstractmethod
-from datetime import tzinfo
 from math import floor
 from pathlib import Path
 from queue import Empty, Queue

src/clp_logging/readers.py

@@ -4,7 +4,6 @@
 from sys import stderr
 from types import TracebackType
 from typing import IO, Iterator, List, Match, Optional, Tuple, Type, Union
-from zoneinfo import ZoneInfo
 
 from clp_ffi_py.ir import FourByteEncoder
 from zstandard import ZstdDecompressionReader, ZstdDecompressor
@@ -31,6 +30,10 @@
     VAR_COMPACT_ENCODING,
 )
 
+try:
+    from zoneinfo import ZoneInfo
+except ImportError:
+    from backports.zoneinfo import ZoneInfo
 
 class Log:
     """