disable implicit optional for mypy (#97)

Mark Kuhn · web-flow · commit a78d1b9ef3a9 · 2023-01-04T14:48:21.000-05:00
diff --git a/mypy.ini b/mypy.ini
@@ -13,4 +13,5 @@
   warn_unused_ignores = False
   warn_return_any = True
   strict_equality = True
-  ignore_missing_imports = True
+  ignore_missing_imports = True
+  no_implicit_optional = False
