• Breaking change: Cow is used in many places to avoid unnecessary allocations (#115, thanks to @jonhoo)
• Add RFC 5464 METADATA response codes (#116, thanks to @jonhoo)
• Add helper methods for the BodyStructure type (#111, thanks to @yageek and @mmirate)

imap-proto 0.12.0 is a minor feature release, which essentially adds support for one new IMAP extension response:

• Add support for RFC7162 (QRESYNC) VANISHED response (#101, thanks to @mordak)
• Mark some enum types as non-exhaustive to hopefully limit semver-incompatible releases
• Upgrade to nom 6

This release contains numerous internal improvements and some hopefully minor API changes.

• Add workaround for Zoho Mail invalid FLAGS response (#91, thanks to @link2xt)
• Add support for RFC 5161 ENABLED extension (#85, thanks to @mordak)
• Add parser for HEADER.FIELDS (#72, thanks to @link2xt)
• Lots of refactoring to make the parsers easier to navigate (#81, #82, thanks to @duesee)

This is a small maintenance release (I erroneously published 0.10.1 incompletely).

• Parse HEADER.FIELDS (fixed in #72, thanks to @link2xt)
• Do not require nom's default features

• Upgrade to tokio 0.2 final release
• Remove some unused dependencies
• Upgrade to latest imap-proto

This release contains one incompatible change: all fields of the Address type as well as some fields of the Envelope type are now &[u8] instead of &str. It turns out that parsing these as UTF-8 was, unfortunately, too restrictive for parsing messages in the wild. Thanks to @link2xt for investigating and fixing this.

• Allow arbitrary bytes for some string fields (#63, thanks to @link2xt)
• Allow invalid continuation responses as seen from Yandex (#68, thanks to @dignifiedquire)

• Added support for the RFC 5464 METADATA extension (#59, thanks to @Sergey-Kitov)
• Fixed a regression in number parsing (introduced in 0.9.0)
• Added a Clone impl for Request

• Initial support for async/await
• Use rustls as the underlying TLS implementation
• Simplify the ImapTransport abstraction

• Corrected parser to allow non-uppercase keywords (thanks to @avitex and @link2xt)
• Upgraded to nom 5 (thanks to @marcusklaas)

• Add support for BODYSTRUCTURE (#48, thanks to @avitex)
• Implement missing response codes (#41, thanks to @Emm54321)
• Parse capabilities into an enum (#47, thanks to @marcelbuesing and @avitex)
• Fix parsing of RFC 3501 test envelope (#39, thanks to @marcelbuesing)

(0.8.0 was skipped due to an error in the crate metadata.)