makes astunparse a req. for Py<3.9

kaushikcfd · inducer · commit a6da414da119 · 2022-08-02T17:15:27.000-05:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,2 +1,3 @@
 # test_matchpy_interop.py
 matchpy
+astunparse; python_version < '3.9'
