Add support for older topic format #4

	name: CI

	on:
	push:

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	hg: [ '5.5', '5.6', '5.7', '5.8', '5.9', '6.0', '6.1', '6.2', '6.3', '6.4' ]
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v4
	with:
	python-version: '3.10'
	- uses: actions/cache@v3
	id: cache-pip
	with:
	path: ~/.cache/pip
	key: pip
	- name: Install hg
	run:
	pip install mercurial==${{ matrix.hg }}
	- run: make test
	test-windows:
	runs-on: windows-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v4
	with:
	python-version: '3.10'
	- uses: actions/cache@v3
	id: cache-pip
	with:
	path: ~/appdata/local/pip/cache
	key: pip-windows
	- name: Install hg
	run:
	pip install mercurial
	- name: Run all tests
	run: \|
	make SHELL='C:/Program Files/Git/usr/bin/bash' -C test

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