deps(pip): pin docker to 7.1.0 #150

	name: CI

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v1
	- name: Set up Python 3.7
	uses: actions/setup-python@v1
	with:
	python-version: 3.7
	- name: Upgrade pip
	run: \|
	python -m pip install --upgrade pip
	- name: Install sandbox requirements
	run: \|
	./build.sh
	pip install -r requirements.txt
	- name: YAPF
	run: \|
	pip install yapf
	yapf . -rd
	- name: Unit test
	run: \|
	pip install -r tests/requirements.txt
	pytest

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