v1.9 beta 1: packaging cleanup and direct PyPI releases

What's Changed

• Adhere to PEP 263 for source encoding by @tovrstra in #111
• assign values to argument namespace instead of parser by @fkloft in #108
• add py3.{7,8} support by @chenrui333 in #145
• CLI tests by @nkrabben in #162
• tox.ini: py37,py38,py39,py310,py311 by @cclauss in #163
• escape doc string by @nkrabben in #171
• Move from pkg resources to importlib by @kba in #172
• Allow fetch.txt with file URLs to validate by @avivace in #154
• is_valid() method can now pass an optional processes parameter to validate() by @gwiedeman in #140
• Use PyPI GitHub Action to publish releases by @acdha in #181

New Contributors

• @tovrstra made their first contribution in #111
• @fkloft made their first contribution in #108
• @kba made their first contribution in #124
• @zimeon made their first contribution in #144
• @chenrui333 made their first contribution in #145
• @dependabot made their first contribution in #151
• @cclauss made their first contribution in #163
• @avivace made their first contribution in #154
• @gwiedeman made their first contribution in #140

Full Changelog: v1.8.1...v1.9b1