Bump core-js from 3.4.8 to 3.6.3

[dependabot-preview]

Bumps core-js from 3.4.8 to 3.6.3.

Changelog

Sourced from core-js's changelog.

3.6.3 - 2020.01.11

• Fixed replacement of substitutes of undefined capture groups in .replace in Safari 13.0-, #471, #745, thanks @mattclough1
• Improved compat data for old engines

3.6.2 - 2020.01.07

• Fixed early implementations of Array#{ every, forEach, includes, indexOf, lastIndexOf, reduce, reduceRight, slice, some, splice } for the usage of ToLength
• Added RegExp#exec dependency to methods which depends on the correctness of logic of this method (3.6.0-3.6.1 issue), #741
• Refactored some internals

3.6.1 - 2019.12.25

• Fixed a bug related Symbol with multiple copies of core-js (for 3.4.2-3.6.0), #736
• Refactored some tools

3.6.0 - 2019.12.19

• Added support of sticky (y) RegExp flag, #372, #732, #492, thanks @cvle and @nicolo-ribaudo
• Added RegExp#test delegation to RegExp#exec, #732, thanks @cvle
• Fixed some cases of Object.create(null) in IE8-, #727, #728, thanks @aleen42
• Allowed object of minimum environment versions as core-js-compat and core-js-builder targets argument
• Allowed corresponding to Babel targets.esmodules, targets.browsers, targets.node options in core-js-compat and core-js-builder
• Engines in compat data and results of targets parsing sorted alphabetically
• Fixed features/instance/match-all entry compat data
• Fixed Array.prototype[@@unscopables] descriptor (was writable)
• Added Samsung Internet 11 compat data mapping

3.5.0 - 2019.12.12

• Added object iteratoration stage 1 proposal:
  • Object.iterateKeys
  • Object.iterateValues
  • Object.iterateEntries

Commits

• 1e63de1 3.6.3
• 6f80aac some missed actions for #745
• 254a227 fixes #471 (#745)
• b9ffdfe some stylistic changes in the documentation
• 113ecbb add a warning about specifying minor core-js version
• 241537f fix esnext.iterator.constructor compat test (some old FF versions with non-...
• c7c5015 update the changelog
• b5490f6 update compat data
• 5aedc36 update es.function.name module compat data
• 9ba1282 update compat data
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #69.