Bump version number to 0.4.0 #22

	name: CI
	on:
	push:
	branches:
	- package
	pull_request:
	paths-ignore:
	- "*.md"

	jobs:
	pypi:
	name: PYPI check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install setuptools wheel twine
	- name: Build and check
	run: \|
	python setup.py sdist bdist_wheel
	twine check dist/*

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