bump go versions used in CI #157

	name: Go

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:

	build_and_test:
	name: Build and test
	runs-on: ubuntu-latest

	strategy:
	fail-fast: false
	matrix:
	go: ['1.19', '1.20', '1.21']

	steps:
	- id: go
	name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go }}

	- name: Checkout
	uses: actions/checkout@v3

	- name: Build
	run: go build -v .

	- name: Test
	run: go test -v -coverprofile=profile.cov .

	- name: Send coverage
	run: bash <(curl -s https://codecov.io/bash) -f profile.cov

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