HTTPoison 2.2.0

What's Changed

fix code snippet(headers) of Multipart in README.md by @TORIFUKUKaiou in https://github.com/edgurgel/httpoison/pull/472
Update README.md: httparrot -> postman-echo by @tamanugi in https://github.com/edgurgel/httpoison/pull/476
Add the request!/1 function by @GuillaumeMilan in https://github.com/edgurgel/httpoison/pull/473
Fix formatting errors on the doc by @michelboaventura in https://github.com/edgurgel/httpoison/pull/477
Update hackney to 1.20.1 by @kyleboe in https://github.com/edgurgel/httpoison/pull/478
Better stack traces by @paulanthonywilson in https://github.com/edgurgel/httpoison/pull/480
Update README.md by @spencerdcarlson in https://github.com/edgurgel/httpoison/pull/479

@TORIFUKUKaiou made their first contribution in https://github.com/edgurgel/httpoison/pull/472
@tamanugi made their first contribution in https://github.com/edgurgel/httpoison/pull/476
@GuillaumeMilan made their first contribution in https://github.com/edgurgel/httpoison/pull/473
@michelboaventura made their first contribution in https://github.com/edgurgel/httpoison/pull/477
@kyleboe made their first contribution in https://github.com/edgurgel/httpoison/pull/478
@paulanthonywilson made their first contribution in https://github.com/edgurgel/httpoison/pull/480
@spencerdcarlson made their first contribution in https://github.com/edgurgel/httpoison/pull/479

Full Changelog: https://github.com/edgurgel/httpoison/compare/v2.1.0...v2.2.0