cxxopts-3.1.1-bp156.1.2

- update to 3.1.1:
  * Fixed version number in header.
  * Support for multiple long names for the same option (=
    multiple long aliases)
  * Add a `program()` function to retrieve the program name.
  * Added a .clang-format file.
  * Added iterator and printing for a ParseResult.
  * Cleanup exception code, add cxxopts::exceptions namespace.
  * Fix `arguments()` having no key for options that only have a
    short name.

- Update descriptions with limitations.
- Trim macros from URL: line (for copy-pasting with mouse).

- Initial package (v3.0.0)