Next-action

Added

- Option to limit the next action to tasks that are over due. Closes 75.

Added

- Option to not read a configuration file. Closes 71.
- Option to write a default configuration file. Closes 68.

Added

- The number of next actions to show can be configured in the configuration file. Closes 65.

Changed

- Use a third-party package to validate the configuration file YAML instead of custom code. Closes 66.

Added

- Next-action can read a configuration file in which the todo.txt file(s) to read can be specified. Closes 40.

Fixed

- Make the demo animated gif visible on the Python Package Index. Fixes 61.

Added

- Add the README file to the package description on the [Python Package Index](https://pypi.org/project/next-action/).
Closes 59.