Update dependency tornado to v6.4 [SECURITY] #697

	# Technically covered by pre-commit - but here as a "double-check" catcher.

	name: Linted

	on:
	push:

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.10
	uses: actions/setup-python@v2
	with:
	python-version: "3.10"
	- name: Install dependencies
	run: pip install .
	- name: Lint with black
	run: \|
	pip install black
	# stop the build if it's not linted as per black
	black --check --diff nbexchange/

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