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

release.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -ex
+
+if [[ -z $(git status -s) ]]
+then
+  if [[ "$VIRTUAL_ENV" != ""  ]]
+  then
+    pip install --upgrade setuptools wheel twine
+    python setup.py sdist bdist_wheel
+    twine upload dist/*
+    rm -rf dist/ build/
+  else
+    echo "this script must be executed inside an active virtual env, aborting"
+  fi
+else
+  echo "git working tree is not clean, aborting"
+fi