updated package setup (#485)

* updated package setup

* updated to use python 3.9

* fixed test runner

* fixed typecheck tests

* fixed discrepencies

* added override to runner

* updated travis

* updated pre-commit hooks

* updated dep

scripts/stubgen-django.py

@@ -0,0 +1,15 @@
+from argparse import ArgumentParser
+
+from mypy.stubgen import generate_stubs, parse_options
+
+from scripts.git_helpers import checkout_django_branch
+from scripts.paths import DJANGO_SOURCE_DIRECTORY
+
+if __name__ == "__main__":
+    parser = ArgumentParser()
+    parser.add_argument("--django_version", required=True)
+    parser.add_argument("--commit_sha", required=False)
+    args = parser.parse_args()
+    checkout_django_branch(args.django_version, args.commit_sha)
+    stubgen_options = parse_options([f"{DJANGO_SOURCE_DIRECTORY}", "-o=stubgen"])
+    generate_stubs(stubgen_options)