Fix FASTG spec link; fix CI; small style fixes #69

	# From
	# https://github.com/fedarko/strainFlye/blob/main/.github/workflows/main.yml
	name: pyfastg CI
	on: [push, pull_request]
	jobs:
	build:
	# Stopgap solution -- "ubuntu-latest" (22.04, as of writing) no longer
	# supports Python 3.6. See https://github.com/fedarko/pyfastg/issues/10.
	runs-on: ubuntu-20.04

	strategy:
	matrix:
	# Gotta specify 3.10 as a string to avoid it being converted to 3.1:
	# https://github.com/actions/setup-python/issues/160
	python-version: [3.6, 3.7, 3.8, 3.9, "3.10", "3.11"]

	steps:

	# https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
	- name: Check out code
	uses: actions/checkout@v3

	# https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install pyfastg (and its pip dependencies)
	run: pip install -e .[dev]

	- name: Run tests
	run: make test

	- name: Lint and stylecheck
	run: make stylecheck

	- name: Upload code coverage information to Codecov
	uses: codecov/codecov-action@v2

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