Release 0.2.1

- Fixed
  - Upgrade to `colombe` version `0.4.0`, this fixes vanishing full
    stop issue, when encoded mail body contains line that stars with
    full stop. See SMTP Transparency for more information:
    https://tools.ietf.org/html/rfc821#section-4.5.2) for more
- Changed
  - Improve service tests
  - Improve documentation for running service tests
- Added
  - Use also *mailtrap.io* in service tests

Release 0.2.0

- Added
  - Support for multipart/alternative emails supporting HTML and plain
    text bodies as alternative representation for the content
  - Add documentation for basic use
  - Add support for detecting CA certificates automatically for peer
    verification
  - Add support defining bundle or single CA certificate for peer
    verification
  - Add support for selecting mechanism for CA certificates used for
    peer verification
- Changed
  - Refactor configurations into separate module
  - Refactor structure of tests

Release 0.1.1

- Fixed
  - Add missing `public_name` stanza in library's dune file to make it
    properly available
  - Fix minimum required OCaml version to 4.08.1
  - Relax `mrmime` and `colombe` dependency constraints

Release 0.1.0

Initial release.