add 'new in LightGBM v4.0' talk #105

	name: Continuous Integration

	# always run CI on new commits to any branch
	on: push

	jobs:
	test:
	name: ${{ matrix.task }}
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	include:
	- task: linting
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	- name: Set up Python
	uses: conda-incubator/setup-miniconda@v2
	with:
	python-version: 3.9
	- name: linting
	if: matrix.task == 'linting'
	shell: bash
	run: \|
	pip install --upgrade black flake8 isort nbqa
	conda install -c conda-forge shellcheck
	make lint
	all-successful:
	# https://github.community/t/is-it-possible-to-require-all-github-actions-tasks-to-pass-without-enumerating-them/117957/4?u=graingert
	runs-on: ubuntu-latest
	needs: [test]
	steps:
	- name: Note that all tests succeeded
	run: echo "🎉"

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