Update dependency commander to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
commander	dependencies	major	^3.0.2 -> ^4.0.0

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Release Notes

tj/commander.js

v4.0.1

Compare Source

Fixed

• display help when requested, even if there are missing required options [(#​1091)]

v4.0.0

Compare Source

Added

• automatically wrap and indent help descriptions for options and commands ([#​1051])
• .exitOverride() allows override of calls to process.exit for additional error handling and to keep program running ([#​1040])
• support for declaring required options with .requiredOptions() ([#​1071])
• GitHub Actions support ([#​1027])
• translation links in README

Changed

• dev: switch tests from Sinon+Should to Jest with major rewrite of tests ([#​1035])
• call default subcommand even when there are unknown options ([#​1047])
• Breaking Commander is only officially supported on Node 8 and above, and requires Node 6 ([#​1053])

Fixed

• Breaking keep command object out of program.args when action handler called ([#​1048])
  • also, action handler now passed array of unknown arguments
• complain about unknown options when program argument supplied and action handler ([#​1049])
  • this changes parameters to command:* event to include unknown arguments
• removed deprecated customFds option from call to child_process.spawn ([#​1052])
• rework TypeScript declarations to bring all types into imported namespace ([#​1081])

Migration Tips

Testing for no arguments

If you were previously using code like:

if (!program.args.length) ...

a partial replacement is:

if (program.rawArgs.length < 3) ...

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