[Snyk] Upgrade core-js from 3.5.0 to 3.6.4

[snyk-bot]

Snyk has created this PR to upgrade core-js from 3.5.0 to 3.6.4.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 5 versions ahead of your current version.
• The recommended version was released 2 months ago, on 2020-01-13.

Release notes

Package name: core-js

• 3.6.4 - 2020-01-13
  
  • Prevented a possible almost infinite loop in non-standard implementations of some backward iteration array methods
• 3.6.3 - 2020-01-10
  
  • 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 - 2020-01-06
  
  • 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 - 2019-12-18
  
  • 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

from core-js GitHub release notes

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[joffutt4]

LGTM