Install importlib_metadata on old Python only

Author: kytta

setup.cfg

@@ -36,6 +36,6 @@ include_package_data = True
 python_requires = >=3.6,<4.0
 install_requires =
     Django>=2.2
-    importlib_metadata
+    importlib_metadata; python_version < '3.8'
 setup_requires =
     setuptools_scm

simple_menu/__init__.py

@@ -1,4 +1,9 @@
-from importlib_metadata import PackageNotFoundError, version
+import sys
+
+if sys.version_info < (3, 8):  # pragma: <3.8 cover
+    from importlib_metadata import PackageNotFoundError, version
+else:  # pragma: >=3.8 cover
+    from importlib.metadata import PackageNotFoundError, version
 
 from .menu import Menu, MenuItem