version 2.1.2
- Fix license chaos, everything is BSD-2-Clause now

version 2.1.1
- Fix parsing of date/time strings without time zone
  information. The output should be UTC so a convertion
  from local time is required here.

version 2.1.0
- Based on output of clang-tidy several improvements
  were made. Mostly performance wise.
- Fix iterators to be std::input_iterator

version 2.0.5
- Renamed to zeem since mxml was already taken

version 2.0.4
- Support for creating shared libs

version 2.0.3
- fix value_serializer for bool
- use correct from_chars (for floats on macOS/FreeBSD)

version 2.0.2
- Replace usage of howard hinnants date with std::chrono

version 2.0.1
- Added missing include file

version 2.0.0
- refactored API

version 1.0.3
- Fix copy constructor of document
- Switch to Catch2 v3 only

version 1.0.2
- Drop the C++20 module setup, it is too early for that.

version 1.0.1
- So sad, when adding one more example a bug was found
  in the value_serializer classes which is now fixed.
- Added real world example showing how you can use DTD
  to validate and extend 'user' input.

version 1.0.0
- initial release