Log Message:
Update to 1.11

Upstream changes:
1.11  2020-09-23  <schubiger@cpan.org>

 - Merged development version to stable.

1.10_04  2020-09-22  <schubiger@cpan.org>

 - Fail when parsing month/day with an explicit ymd-format.

1.10_03  2020-09-19  <schubiger@cpan.org>

 - Clarify meaning of format option.
   [rt #133200 - Ricardo Signes]

1.10_02  2020-09-05  <schubiger@cpan.org>

 - Allow mm/dd and dd/mm as valid formats and amend tests.

 - Improve format matching regexes.

 - List example with new format under examples section.

1.10_01  2020-08-21  <schubiger@cpan.org>

 - Allow configuration to make "8/10" mean October 8.
   [rt #133140 - Ricardo Signes]

 - Minor tweaks.