Update core-js requirement from ^3.5.0 to ^3.6.0 in /resources/frontend/app

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Updates the requirements on core-js to permit the latest version.

Changelog

Sourced from core-js's changelog.

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](https://github.com/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

3.4.8 - 2019.12.09

• Added one more workaround for broken in previous versions inspectSource helper, #719
• Added Opera Mobile compat data
• Updated Samsung Internet, iOS, old Node and Android compat data mapping
• es.string.match-all marked as completely supported in FF73
• Generate core-js-compat/modules since often we need just the list of core-js modules

2.6.11 [LEGACY] - 2019.12.09

• Returned usage of node -e in the postinstall scripts for better cross-platform compatibility, #582
• Improved CI detection in the postinstall script, #707

3.4.7 - 2019.12.03

• Fixed an NPM publishing issue

3.4.6 - 2019.12.03

• Improved iOS compat data - added missed mapping iOS 12.2 -> Safari 12.1, added bug fixes from patch releases
• Added Safari 13.1 compat data
• Added missed in core-js-compat helpers ie_mob normalization
• Normalize the result of getModulesListForTargetVersion core-js-compat helper
• Improved CI detection in the postinstall script, #707

3.4.5 - 2019.11.28

• Detect incorrect order of operations in Object.assign, MS Edge bug
• Detect usage of ToLength in Array#{ filter, map }, FF48-49 and MS Edge 14- issues
• Detect incorrect MS Edge 17-18 Reflect.set which allows setting the property to object with non-writable property on the prototype
• Fixed inspectSource helper with multiple core-js copies and some related features like some edge cases of Promise feature detection

3.4.4 - 2019.11.27

• Added feature detection for Safari non-generic Promise#finally bug (critical for core-js-pure)
• Fixed missed esnext.string.code-points in core-js/features/string entry point
• Updated Iterator proposal feature detection for the case of non-standard Iterator in FF44-

3.4.3 - 2019.11.26

... (truncated)

Commits

• f10bf27 3.6.0
• 3171d47 fix Array.prototype[@[@​unscopables](https://github.com/unscopables)] descriptor
• 6c10843 update documentation
• ff4f391 some missed actions for #732
• 80d7bfe Sticky RegExp 'y' and RegExp#test delegation (#732)
• 62716b6 updated the changelog, some stylistic changes
• 5e193bf Merge pull request #728 from aleen42/object.create
• eaf1bd3 pin semver to 7.0 since 7.1 does not support Node 8
• d101fd4 add support of browserslist aliases to targets object
• 35e400f chore: add a comment
• Additional commits viewable in compare view

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