Release v1.4.0

Changes

🚀 Features

• Support getting raw email from s3 (#201) @harryzcy
• Record read/unread status of an email (#200) @harryzcy
• Support attachments for inbox emails (#194) @harryzcy

🧰 Maintenance

• [doc] Document response type for each API (#198) @harryzcy
• Migrate to amazon linux 2 runtime (#197) @harryzcy
• Remove deprecated ioutil (#195) @harryzcy
• [doc] Include link to mailbox-browser in README (#192) @harryzcy

⬆️ Dependencies

• Upgrade go dependencies (#202) @harryzcy
• Update all non-major dependencies (#193) @renovate