Update dependency commander to ~2.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
commander	dependencies	minor	~2.19.0 -> ~2.20.0	source

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Release Notes

tj/commander.js

v2.20.0

Compare Source

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• fix: resolve symbolic links completely when hunting for subcommands (#​935)
• Update index.d.ts (#​930)
• Update Readme.md (#​924)
• Remove --save option as it isn't required anymore (#​918)
• Add link to the license file (#​900)
• Added example of receiving args from options (#​858)
• Added missing semicolon (#​882)
• Add extension to .eslintrc (#​876)

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