Add function to compute distance between one event and a catalog #75

	name: Flake8 Linter
	on:
	pull_request:
	jobs:
	flake8-linter:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout source
	uses: actions/checkout@v3
	- name: Install Python 3.10
	uses: actions/setup-python@v4
	with:
	python-version: '3.10'
	- name: Install Flake8 5.0.4 linter
	run: pip install flake8==5.0.4 # use this version for --diff option
	- name: Setup Flake8 output matcher for PR annotations
	run: echo '::add-matcher::.github/workflows/flake8-linter-matcher.json'
	- name: Fetch pull request target branch
	run: \|
	git remote add upstream https://github.com/eqcorrscan/EQcorrscan.git
	git fetch upstream $GITHUB_BASE_REF
	- name: Run Flake8 linter
	run: git diff upstream/$GITHUB_BASE_REF HEAD \| flake8
	--exclude eqcorrscan/doc
	--ignore W605,W504,W503
	--max-line-length 80
	--diff

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