ArgumentParser 1.2.1

Changes

• Documentation is now primarily hosted at the Swift Package Index.

Fixes

• exit(_:) no longer causes infinite recursion on the WASI platform. (#520)
• Completion scripts for fish now provide completions after a non-hyphen-prefixed argument has been provided. (#535)
• Overload selection for custom ExpressibleByArgument types has been improved. (#522)
• The usage string for .postTerminator arguments now includes the required terminator (--). (#542)
• Documentation and testing fixes and improvements.

The 1.2.1 release includes contributions from @Chamepp, @KKK669, @mtj0928, @natecook1000, @rauhul, @rickrizzo, @TiagoMaiaL, and @yim-lee. Thank you!