Log Message:
Update to 1.18

Upstream changes:
1.18  2023-10-05  <schubiger@cpan.org>

 - Merged development version to stable.

1.17_02  2023-10-03  <schubiger@cpan.org>

 - Validate 'daytime' parameter.

1.17_01  2023-10-01  <schubiger@cpan.org>

 - Minor wording tweak.

 - Minor indentation tweak.

1.17  2023-06-20  <schubiger@cpan.org>

 - Merged development version to stable.

 - Minor tweak.