Support versions of python back to 3.9.

tests/test_packageversion.py

@@ -8,7 +8,7 @@ def setUp(self) -> None:
         """Set up before each test."""
         # Note that this will have to be updated manually
         # as we update versions in pyproject.toml.
-        self.expected_version = "0.1.0"
+        self.expected_version = "0.1.1"
 
     def asserExpectedVersion(self, version: str):
         self.assertTrue(