Update core-js requirement from ^2.5.1 to ^3.1.3

[dependabot-preview]

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

Changelog

Sourced from core-js's changelog.

3.1.3 - 2019.05.27

• Fixed core-js/features/reflect/delete-metadata entry point
• Some fixes and improvements of the postinstall script like support npm color config (#556) or adding support of ADBLOCK env variable
• Refactoring and some minor fixes

2.6.9 [LEGACY] - 2019.05.27

• Some fixes and improvements of the postinstall script like support npm color config (#556) or adding support of ADBLOCK env variable

3.1.2 - 2019.05.22

• Added a workaround of a strange npx bug on postinstall, #551

2.6.8 [LEGACY] - 2019.05.22

• Added a workaround of a strange npx bug on postinstall, #551

3.1.1 - 2019.05.21

• Added one more workaround of alternative not completely correct Symbol polyfills, #550, #554
• Reverted esnext.string.match-all in some entry points for fix autogeneration of core-js-compat/entries and backward @babel/preset-env compatibility

2.6.7 [LEGACY] - 2019.05.21

• Added one more workaround of alternative not completely correct Symbol polyfills, #550, #554

3.1.0 - 2019.05.20

• String#matchAll moved to stable ES, exposed Symbol.matchAll, #516
• Promise.allSettled moved to stage 3, #515
• String#replaceAll moved to stage 2, behavior updated by the spec draft, #524
• Promise.any moved to stage 1, #517
• Removed es.regexp.flags dependency from es.regexp.to-string, #536, #537
• Fixed IE8- non-enumerable properties support in Object.{ assign, entries, values }, #541
• Fixed support of primitives in Object.getOwnPropertySymbols in Chrome 38 / 39, #539
• window.postMessage-based task implementation uses location origin over '*', #542
• Lookup PromiseConstructor.resolve only once in Promise combinators, tc39/ecma262#1506
• Temporarily removed core-js dependency from core-js-compat since it's required for missed at this moment feature
• Show a message on postinstall
• Added compat data for Chrome 76, FF 67, Node 12

2.6.6 [LEGACY] - 2019.05.20

• Fixed IE8- non-enumerable properties support in Object.{ assign, entries, values }, #541
• Fixed support of primitives in Object.getOwnPropertySymbols in Chrome 38 / 39, #539
• Show a message on postinstall

3.0.1 - 2019.04.06

• Fixed some cases of work with malformed URI sequences in URLSearchParams, #525
• Added a workaround for a rollup issue, #513

3.0.0 - 2019.03.19

• Features
  • Add new features:
    • Object.fromEntries (ECMAScript 2019)
    • Symbol#description (ECMAScript 2019)
    • New Set methods (stage 2 proposal)

... (truncated)

Commits

• 16dc3b2 3.1.3
• c663d52 update the changelog
• 8a108bd update the postinstall message
• 22e02b0 update eslint-plugin-import
• 6e31068 move require to heads of files, enable some related eslint rules
• a04f34d don't replace available Map.{ groupBy, keyBy } in the pure version
• 55f7e94 get rid of some duplications between /stable/ and /features/
• bb6e9f8 fix core-js/features/reflect/delete-metadata entry point
• b843714 use internal reduce method in %TypedArrayPrototype% methods for prevent p...
• 4e4bb8f use echo instead of true in postinstall
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #57.