Bump uglifier from 4.1.20 to 4.2.0

[dependabot-preview[bot]]

Bumps uglifier from 4.1.20 to 4.2.0.

Changelog

Sourced from uglifier's changelog.

4.2.0 (25 September 2019)

• show code context for error messages (#167)
• defer initialisation of ExecJS context to fix #165

Commits

• 77226d1 Bump version to 4.2.0
• ac86e3e Update changelog
• 18f0419 Ignore Rubocop warning
• 3ff23bb Use new GitHub actions syntax
• 116444d Handle unexpected error messages better
• 9de67eb Defer initialisation of ExecJS context
• 990a6eb Expand abbreviations in variable names
• 4f65798 Refactor error context line option handling
• 5e544f5 Fix typo in method name
• 9958a20 Merge pull request #167 from eGust/err-context-lines
• Additional commits viewable in compare view

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[jefferya]

@dependabot ignore this minor version

[dependabot-preview[bot]]

OK, I won't notify you about version 4.2.x again, unless you re-open this PR or update to a 4.2.x release yourself.