Refactor version retrieval to use importlib.metadata

Author: jacalata

tabcmd/version.py

@@ -1,9 +1,6 @@
-# when we drop python 3.8, this could be replaced with this lighter weight option
-# from importlib.metadata import version, PackageNotFoundError
-from pkg_resources import get_distribution, DistributionNotFound
+from importlib.metadata import version, PackageNotFoundError
 
 try:
-    version = get_distribution("tabcmd").version
-except DistributionNotFound:
+    version = version("tabcmd")
+except PackageNotFoundError:
     version = "2.0.0"
-    pass