fix: use importlib-metadata backport for older systems

pyproject.toml

@@ -28,6 +28,7 @@ classifiers = [
 ]
 requires-python = ">= 3.6"
 dependencies = [
+        'importlib-metadata; python_version < "3.10"',
         "python-configuration",
 ]
 

src/wuttjamaican/_version.py

@@ -1,6 +1,9 @@
 # -*- coding: utf-8; -*-
 
-from importlib.metadata import version
+try:
+    from importlib.metadata import version
+except ImportError:
+    from importlib_metadata import version
 
 
 __version__ = version('WuttJamaican')