Replace pkg_resources with importlib.metadata

fawltydeps/main.py

@@ -9,8 +9,6 @@
 from pathlib import Path
 from typing import List, Optional, Set, TextIO
 
-import pkg_resources
-
 from fawltydeps import extract_imports
 from fawltydeps.check import compare_imports_to_dependencies
 from fawltydeps.extract_declared_dependencies import extract_declared_dependencies
@@ -23,6 +21,11 @@
     UnusedDependency,
 )
 
+if sys.version_info >= (3, 8):
+    import importlib.metadata as importlib_metadata
+else:
+    import importlib_metadata
+
 logger = logging.getLogger(__name__)
 
 
@@ -138,7 +141,7 @@ def main() -> int:
         "-V",
         "--version",
         action="version",
-        version=f"Fawltydeps {pkg_resources.get_distribution('fawltydeps').version}",
+        version=f"Fawltydeps {importlib_metadata.version('fawltydeps')}",
         help=("Print the version number of fawltydeps"),
     )
     select_action.add_argument(