[Snyk] Upgrade core-js from 3.4.5 to 3.4.7

[snyk-bot]

Snyk has created this PR to upgrade core-js from 3.4.5 to 3.4.7.

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 2 versions ahead of your current version.
• The recommended version was released 8 days ago, on 2019-12-02.

Release notes

Package name: core-js

• 3.4.7 - 2019-12-02
  
  • Fixed an NPM publishing issue
• 3.4.6 - 2019-12-02
  
  • 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 - 2019-11-27
  
  • 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

from core-js GitHub release notes

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