Release v0.2.3

What's Changed

• Quote commas in test emails' addresses according to RFC5322 by @mnako in #80
• Chore: Lint YAML files by @mnako in #81
• Export letters.ParseHeaders() so that a message can be parsed into letters.Headers only by @mnako in #85
• Fix/golangci lint 1.61 warnings: Fix SA1019: "io/ioutil" has been deprecated since Go 1.19 in favour of "io" by @mnako in #92
• Test against Go 1.23 by @mnako in #95
• Bump version in README.md in preparation to release v0.2.3 by @mnako in #98

Updates

• Bump version in README.md to release v0.2.2 by @mnako in #58
• Bump golang.org/x/net from 0.17.0 to 0.18.0 by @dependabot in #63
• Bump golang.org/x/net from 0.18.0 to 0.19.0 by @dependabot in #65
• Bump actions/setup-go from 4 to 5 by @dependabot in #66
• Bump golang.org/x/net from 0.19.0 to 0.20.0 by @dependabot in #69
• Bump golang.org/x/net from 0.20.0 to 0.21.0 by @dependabot in #70
• Bump golangci/golangci-lint-action from 3 to 4 by @dependabot in #71
• Bump golang.org/x/net from 0.21.0 to 0.27.0 by @dependabot in #83
• Bump actions/setup-go from 5.0.1 to 5.0.2 by @dependabot in #84
• Bump golangci/golangci-lint-action from 6.0.1 to 6.1.1 by @dependabot in #94
• Bump actions/checkout from 4.1.7 to 4.2.0 by @dependabot in #93
• Bump golang.org/x/net from 0.27.0 to 0.29.0 by @dependabot in #91
• Bump golang.org/x/text from 0.18.0 to 0.19.0 by @dependabot in #96
• Bump golang.org/x/net from 0.29.0 to 0.30.0 by @dependabot in #97

Full Changelog: v0.2.2...v0.2.3