What's Changed

• Add Linux as CI in appveyor by @moh-hassan in https://github.com/commandlineparser/commandline/pull/598
• Add multi-instance option support by @rmunn in https://github.com/commandlineparser/commandline/pull/594
• add support for flags enums by @shaosss in https://github.com/commandlineparser/commandline/pull/623
• Expose value and error on parser result by @johnjaylward in https://github.com/commandlineparser/commandline/pull/634
• Verb aliases by @johnjaylward in https://github.com/commandlineparser/commandline/pull/636
• Fix unparsing FileInfo and DirectoryInfo by @kapsiR in https://github.com/commandlineparser/commandline/pull/627
• fix spacing on help messages when verbs have aliases by @johnjaylward in https://github.com/commandlineparser/commandline/pull/650
• Extend UnparserExtension with FormatCommandLineArgs and SplitArgs methods by @moh-hassan in https://github.com/commandlineparser/commandline/pull/662
• Allow single dash as a value by @moh-hassan in https://github.com/commandlineparser/commandline/pull/669
• Add multi-instance option support by @rmunn in https://github.com/commandlineparser/commandline/pull/678
• Sequences that hit max should stop grabbing values by @rmunn in https://github.com/commandlineparser/commandline/pull/682
• Add GetoptMode parser setting and implementation by @rmunn in https://github.com/commandlineparser/commandline/pull/684
• Add missing interpolation character by @marcinotorowski in https://github.com/commandlineparser/commandline/pull/803
• Fix for #776 and #797 by @batzen in https://github.com/commandlineparser/commandline/pull/798
• added link to Option groups by @pentop in https://github.com/commandlineparser/commandline/pull/790
• Remove System.Linq.Expressions dependency. by @NN--- in https://github.com/commandlineparser/commandline/pull/764
• Resourcetype with implicit and explicit cast by @gorsheninmv in https://github.com/commandlineparser/commandline/pull/758

New Contributors

• @rmunn made their first contribution in https://github.com/commandlineparser/commandline/pull/594
• @shaosss made their first contribution in https://github.com/commandlineparser/commandline/pull/623
• @johnjaylward made their first contribution in https://github.com/commandlineparser/commandline/pull/634
• @kapsiR made their first contribution in https://github.com/commandlineparser/commandline/pull/627
• @marcinotorowski made their first contribution in https://github.com/commandlineparser/commandline/pull/803
• @batzen made their first contribution in https://github.com/commandlineparser/commandline/pull/798
• @pentop made their first contribution in https://github.com/commandlineparser/commandline/pull/790
• @NN--- made their first contribution in https://github.com/commandlineparser/commandline/pull/764
• @gorsheninmv made their first contribution in https://github.com/commandlineparser/commandline/pull/758

Full Changelog: https://github.com/commandlineparser/commandline/compare/2.8.0...v2.9.1