Version 1.5.1: Access

This patch release adds better access to the App progromatically, to assist with writing custom converters to other formats. It also improves the help output, and uses a new feature in CLI11 1.5 to fix an old "quirk" in the way unlimited options and positionals interact.

* Make mixing unlimited positionals and options more intuitive [#102]
* Add missing getters `get_options` and `get_description` to App [#105]
* The app name now can be set, and will override the auto name if present [#105]
* Add `(REQUIRED)` for required options [#104]
* Print simple name for Needs/Excludes [#104]
* Use Needs instead of Requires in help print [#104]
* Groups now are listed in the original definition order [#106]

[#102]: https://github.com/CLIUtils/CLI11/issues/102
[#104]: https://github.com/CLIUtils/CLI11/pull/104
[#105]: https://github.com/CLIUtils/CLI11/issues/105
[#106]: https://github.com/CLIUtils/CLI11/pull/106
This tag has no release notes.