Log Message:
khard: update to 0.16.0.

v0.16.0: 2020-04-04
- Require python >= 3.6
- Require either default_action or a subcommand
- Twinkle sound samples converted to .ogg (#228)
- Expand documentation
- Build and server documentation on https://khard.readthedocs.io/
- Allow display=formatted_name in config
- New --fields option for list subcommand
- Internal changes:
  - Expanded the test suite
  - Use of python type annotations, checked on travis
  - Represent queries as custom data structures not regex
  - Use custom loggers per module