- update to 3.2.1:
  * Fix compilation with optional on C++20.
  * Fix unannotated fallthrough.
  * Fix sign conversion with Unicode output.
  * Don't initialize regex in static initialiser.
  * Fix incorrect integer overflow checks.
  * Change quote output to '' to match Windows.
  * Don't split positional arguments by the list delimiter.
  * Order help groups by the order they were added.

    short name.

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- 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.

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Required for new version of pamixer

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