Bump terser from 4.8.0 to 5.2.0

[dependabot-preview]

Bumps terser from 4.8.0 to 5.2.0.

Changelog

Sourced from terser's changelog.

v5.2.0

• Optional chaining syntax is now supported.
• Consecutive await expressions don't have unnecessary parens
• Taking the variable name's length (after mangling) into consideration when deciding to inline

v5.1.0

• import.meta is now supported
• Typescript typings have been improved

v5.0.0

• in operator now taken into account during property mangle.
• Fixed infinite loop in face of a reference loop in some situations.
• Kept exports and imports around even if there's something which will throw before them.
• The main exported bundle for commonjs, dist/bundle.min.js is no longer minified.

v5.0.0-beta.0

• BREAKING: minify() is now async and rejects a promise instead of returning an error.
• BREAKING: Internal AST is no longer exposed, so that it can be improved without releasing breaking changes.
• BREAKING: Lowest supported node version is 10
• BREAKING: There are no more warnings being emitted
• Module is now distributed as a dual package - You can import and require() too.
• Inline improvements were made

Commits

• e0c1a2b 5.2.0
• 3e0e59e update changelog
• 7aad3cb initial implementation of optional chaining (a?.b?.(c))
• 23abbc3 remove some unused code, assume mangled variables have length 1
• b573cda take variable name length into consideration before inlining.
• 82be4b4 remove unnecessary parens in consecutive awaits.
• 9dc2dcd Add module to package.json (#784)
• 491d8d0 5.1.0
• 612e0b3 update changelog
• ff851d2 fix typings (#779)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #170.