Use importlib.reload instead of imp.reload (Python 3.12 compat) (#211)

* Prefer importlib.reload to imp.reload

In aeidon/test/test_locales.py, use importlib.reload where available
(Python 3.4 and later) instead of imp.reload; the imp module has been
deprecated since Python 3.4 and is removed in Python 3.12, so this is a
Python 3.12 compatibility fix.

* Do not claim to support Python versions before 3.4

README.md

@@ -39,7 +39,7 @@ and gettext to build the Flatpak.
 
 #### Source
 
-Gaupol requires Python ≥ 3.2, PyGObject ≥ 3.12 and GTK ≥ 3.12.
+Gaupol requires Python ≥ 3.4, PyGObject ≥ 3.12 and GTK ≥ 3.12.
 Additionally, during installation you need gettext. Optional, but
 strongly recommended dependencies include:
 

aeidon/test/test_locales.py

@@ -16,7 +16,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 import aeidon
-import imp
+import importlib
 
 from aeidon.i18n   import _, d_
 from unittest.mock import patch
@@ -46,10 +46,10 @@ def test_get_system_code(self):
 
     @patch.dict("os.environ", dict(LANGUAGE="sr@Latn"))
     def test_get_system_modifier__latn(self):
-        imp.reload(aeidon.locales)
+        importlib.reload(aeidon.locales)
         assert aeidon.locales.get_system_modifier() == "Latn"
 
     @patch.dict("os.environ", dict(LANGUAGE="en"))
     def test_get_system_modifier__none(self):
-        imp.reload(aeidon.locales)
+        importlib.reload(aeidon.locales)
         assert aeidon.locales.get_system_modifier() is None