Bump core-js from 2.6.3 to 3.4.3

[dependabot-preview]

Bumps core-js from 2.6.3 to 3.4.3.

Changelog

Sourced from core-js's changelog.

3.4.3 - 2019.11.26

• Fixed missed es.json.stringify and some modules from iteration helpers proposal in some entry points
• Added a workaround of String#{ endsWith, startsWith } MDN polyfills bugs, #702
• Fixed .size property descriptor of Map / Set in the pure version
• Refactoring, some internal improvements

3.4.2 - 2019.11.22

• Don't use polyfilled symbols as internal uids, a workaround for some incorrect use cases
• String#replaceAll is available only in nightly FF builds
• Improved Promise feature detection for the case of V8 6.6 with multiple core-js copies
• Some internals optimizations
• Added Node 13.2 -> V8 7.9 compat data mapping
• Returned usage of node -e in postinstall scripts

3.4.1 - 2019.11.12

• Throw when (Async)Iterator#flatMap mapper returns a non-iterable, per tc39/proposal-iterator-helpers/55 and tc39/proposal-iterator-helpers/59
• Removed own AggregateError#toString, per tc39/proposal-promise-any/49
• Global core-js Promise polyfill passes feature detection in the pure versions
• Fixed indexes in String#replaceAll callbacks
• String#replaceAll marked as supported by FF72

3.4.0 - 2019.11.07

• Added well-formed JSON.stringify, ES2019 feature, thanks @​ExE-Boss and @​WebReflection for the idea
• Fixed Math.signbit, #687, thanks @​chicoxyzzy

3.3.6 - 2019.11.01

• Don't detect Chakra-based Edge as Chrome in the userAgent parsing
• Fixed inheritance in typed array constructors wrappers, #683
• Added one more workaround for correct work of early fetch implementations with polyfilled URLSearchParams, #680

3.3.5 - 2019.10.29

• Added a workaround of V8 deoptimization which causes serious performance degradation (~4x in my tests) of Array#concat, #679
• Added a workaround of V8 deoptimization which causes slightly performance degradation of Promise, #679
• Added (Async)Iterator.prototype.constructor -> (Async)Iterator per this issue
• Added compat data for Chromium-based Edge

3.3.4 - 2019.10.25

• Added a workaround of V8 deoptimization which causes serious performance degradation (~20x in my tests) of some RegExp-related methods like String#split, #306
• Added a workaround of V8 deoptimization which causes serious performance degradation (up to 100x in my tests) of Array#splice and slightly Array#{ filter, map }, #677
• Fixed work of fetch with polyfilled URLSearchParams, #674
• Fixed an edge case of String#replaceAll with an empty search value
• Added compat data for Chrome 80
• package-lock.json no longer generated in libraries

3.3.3 - 2019.10.22

• gopher removed from URL special cases per this issue and this PR
• Added compat data for iOS 13 and Node 13.0

3.3.2 - 2019.10.14

• Fixed compatibility of core-js-compat with Node 6 and Yarn, #669

... (truncated)

Commits

• 8764add 3.4.3
• 4ab0049 add a test of root entries content
• 3643b37 fix missed modules from iteration helpers proposal in some entry points
• f09e131 fix missed es.json.stringify in some entry points
• 02776f5 update the changelog
• 6e1b877 remove unnecessary usage of fails
• 7a57493 add a workaround of String#{ endsWith, startsWith } MDN polyfills bugs, clo...
• 09529a1 get rid of some collection arguments
• 86bf925 fix Map / Set .size property descriptor in the pure version
• be18289 update dependencies
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #625.