build

Update Makefile #97

	name: build
	on: [push, pull_request]
	jobs:
	build:
	runs-on: ubuntu-20.04
	strategy:
	matrix:
	erlang:
	- 1:25.3-1
	elixir:
	- 1.13.4-1
	steps:
	- uses: actions/checkout@v2
	- name: Install Erlang
	run: \|
	wget https://packages.erlang-solutions.com/erlang-solutions_2.0_all.deb
	sudo dpkg -i erlang-solutions_2.0_all.deb
	sudo apt update
	sudo apt install -y --allow-downgrades esl-erlang=${{ matrix.erlang }}
	- name: Install Elixir
	run: \|
	sudo apt install -y elixir=${{ matrix.elixir }}
	- name: Run tests
	run: \|
	git checkout -b v3.12.x
	make
	make tests

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