Use importlib to determine codebasin version

Signed-off-by: John Pennycook <john.pennycook@intel.com>

Author: Pennycook

codebasin/__main__.py

@@ -6,6 +6,7 @@
 """
 
 import argparse
+import importlib.metadata
 import logging
 import os
 import sys
@@ -14,7 +15,7 @@
 from codebasin._detail.logging import Formatter, WarningAggregator
 
 log = logging.getLogger("codebasin")
-version = "1.2.0"
+version = importlib.metadata.version("codebasin")
 
 _traceback = False