Update module github.com/urfave/cli/v2 to v2.20.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/urfave/cli/v2	require	minor	v2.19.2 -> v2.20.2

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Release Notes

urfave/cli

v2.20.2

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What's Changed

• Fix:(issue_1206) Default value shouldnt depend on env variable or val… by @​dearchap in https://github.com/urfave/cli/pull/1528

Full Changelog: urfave/cli@v2.20.1...v2.20.2

v2.20.1

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What's Changed

• Docs: Fix docs from merged PR1498 by @​dearchap in https://github.com/urfave/cli/pull/1532
• Cleanup: Fix app.go formatting by @​dearchap in https://github.com/urfave/cli/pull/1533

Full Changelog: urfave/cli@v2.20.0...v2.20.1

v2.20.0

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What's Changed

• Cleanup redundant code in App/Command by @​dearchap in https://github.com/urfave/cli/pull/1498

Full Changelog: urfave/cli@v2.19.3...v2.20.0

v2.19.3

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What's Changed

• Build and run urfave-cli-genflags via its Makefile by @​meatballhat in https://github.com/urfave/cli/pull/1526

Full Changelog: urfave/cli@v2.19.2...v2.19.3

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