fix(deps): update dependency commander to v2.20.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
commander	2.12.2 -> 2.20.3

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Release Notes

tj/commander.js

v2.20.3

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Ran "npm unpublish commander@2.20.2". There is no 2.20.2.

Fixed

• Support Node.js 0.10 (Revert #​1059)

v2.20.1

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Fixed

• Improve tracking of executable subcommands.

Changed

• update development dependencies

v2.20.0

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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)

v2.19.0

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• Removed newline after Options and Commands headers (#​864)
• Bugfix - Error output (#​862)
• Fix to change default value to string (#​856)

v2.18.0

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• Standardize help output (#​853)
• chmod 644 travis.yml (#​851)
• add support for execute typescript subcommand via ts-node (#​849)

v2.17.1

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• Fix bug in command emit (#​844)

v2.17.0

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• fixed newline output after help information (#​833)
• Fix to emit the action even without command (#​778)
• npm update (#​823)

v2.16.0

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• Remove Makefile and test/run (#​821)
• Make 'npm test' run on Windows (#​820)
• Add badge to display install size (#​807)
• chore: cache node_modules (#​814)
• chore: remove Node.js 4 (EOL), add Node.js 10 (#​813)
• fixed typo in readme (#​812)
• Fix types (#​804)
• Update eslint to resolve vulnerabilities in lodash (#​799)
• updated readme with custom event listeners. (#​791)
• fix tests (#​794)

v2.15.1

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fix #​777
Released with npm@5.6.0

v2.15.0

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• Update downloads badge to point to graph of downloads over time instead of duplicating link to npm
• Arguments description

v2.14.1

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• Fix typing of help function

v2.14.0

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• only register the option:version event once
• Fixes issue #​727: Passing empty string for option on command is set to undefined
• enable eqeqeq rule
• resolves #​754 add linter configuration to project
• resolves #​560 respect custom name for version option
• document how to override the version flag
• document using options per command

v2.13.0

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• Do not print default for --no-
• remove trailing spaces in command help
• Update CI's Node.js to LTS and latest version
• typedefs: Command and Option types added to commander namespace

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