Negative option (--no-option) didn't work

[gilles-crealp]

Describe the bug
When you set a negative option (--no-xxx) the option xxx is always set to false.

To Reproduce

program
  .command('test')
  .option('--no-xxx')
  .action(({ options }) => console.log(options.xxx))

Run with and without --no-xxx.

Expected behavior
options.xxx must be true without --no-xxx and false with --no-xxx.

Actual behavior
options.xxx is always false.

Environment informations

• OS: Windows
• OS version: 10
• Shell: cmd
• Caporal version: 2.0.2