define pandas version as 1.4 #487

	name: package

	on: [push]

	jobs:
	build-linux:
	runs-on: ubuntu-latest
	strategy:
	max-parallel: 5
	defaults:
	run:
	shell: bash -l {0}
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.9
	uses: actions/setup-python@v4
	with:
	python-version: 3.9
	- name: Lint with flake8
	run: \|
	pip install flake8
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with pytest
	run: \|
	pip install pytest
	pip install -e .
	pytest

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