args 6.6.0

A header-only C++ argument parser library. Supposed to be flexible and powerful, and attempts to be compatible with the functionality of the Python standard argparse library (though not necessarily the API).

Release notes

## What's Changed
* Constant flag by @iWiggins in https://github.com/Taywee/args/pull/186
* Fix for duplicate arguments bug 117 by @iWiggins in https://github.com/Taywee/args/pull/187
* honour joined-value separation for optional-argument flags by @metsw24-max in https://github.com/Taywee/args/pull/188
* fix const-correctness of ConstantFlag::operator-> by @metsw24-max in https://github.com/Taywee/args/pull/190
* scope duplicate-flag detection to command boundaries by @metsw24-max in https://github.com/Taywee/args/pull/191
* allow nargs to work with joined values by @Taywee in https://github.com/Taywee/args/pull/193


**Full Changelog**: https://github.com/Taywee/args/compare/6.5.0...6.6.0

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