Use github actions for builds #1

	name: Build
	on: [push, pull_request]
	jobs:

	test:
	runs-on: ubuntu-latest
	container: nimlang/choosenim
	strategy:
	matrix:
	threads: [on, off]
	nim: [ 2.0.0, 1.6.14 ]
	steps:
	- uses: actions/checkout@v1
	- name: Choose Nim
	run: choosenim update -y ${{ matrix.nim }}
	- name: Safe git directory
	run: git config --global --add safe.directory "$(pwd)"
	- name: Test
	run: nimble --threads:${{ matrix.threads }} test -y

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