*asyncio aiohttp refactor*
- Replace requests with aiohttp - `PR 440`
- Replace xmlrpc2 with aiohttp-xmlrpc - `PR 404`
- Only store PEP503 Normalized Simple API directories - `PR 465 + 455`
- Flag errors when KeyboardInterrupt raised during sync - `PR 421`
- Finish Windows Support + Add CI - `PRs 469 + 471` - Thanks **FaustinCarter**
- Autobuild Docker images with master - `PR 88` - Thanks **abitrolly**
- Only print conf deprecations if found in config - `PR 327`
- Add PyPI metadata and Python version plugin filters - `PR 391` - Thanks **TemptorSent**
- Add in *GitHub Actions CI* for Linux (Ubuntu), MacOSX + Windows