Added

• Added requireConfirmation parameter to option().prompt() (#426)
• Added CliktCommand.terminal extension for accessing the terminal from a command.
• Added includeSystemEnvvars, ansiLevel, width, and height parameters to all CliktCommand.test overloads.

Deprecated

• Deprecated CliktCommand.prompt, use CliktCommand.terminal.prompt or Prompt instead.
• Deprecated CliktCommand.confirm, use YesNoPrompt instead.