remove ubuntu 18, update to latest #19

	name: test
	on: [push, pull_request]
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: build solver
	shell: bash
	run: \|
	sudo apt-get -y install libboost-all-dev
	mkdir build_skyline
	cd build_skyline
	cmake ..
	make
	- name: install dependencies
	run: \|
	pip install pytest pytest-cov pytest-mock
	pip install numpy
	- name: result tests
	run: \|
	pytest

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