[Snyk] Upgrade core-js from 3.6.2 to 3.6.3

[snyk-bot]

Snyk has created this PR to upgrade core-js from 3.6.2 to 3.6.3.

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 1 version ahead of your current version.
• The recommended version was released 8 days ago, on 2020-01-10.

Release notes

Package name: core-js

• 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

from core-js GitHub release notes

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