[Snyk] Upgrade core-js from 2.5.7 to 2.6.10

[snyk-bot]

Snyk has created this PR to upgrade core-js from 2.5.7 to 2.6.10.

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 11 versions ahead of your current version.
• The recommended version was released 2 months ago, on 2019-10-13.

Release notes

Package name: core-js

• 2.6.10 - 2019-10-13
  
  • Show similar postinstall messages only once per npm i, #597
• 2.6.9 - 2019-05-27
  
  • Some fixes and improvements of the postinstall script like support npm color config (#556) or adding support of ADBLOCK env variable
• 2.6.8 - 2019-05-21
  
  • Added a workaround of a strange npx bug on postinstall, #551
• 2.6.7 - 2019-05-20
• 2.6.6 - 2019-05-19
• 2.6.5 - 2019-02-15
• 2.6.4 - 2019-02-07
• 2.6.3 - 2019-01-22
• 2.6.2 - 2019-01-10
• 2.6.1 - 2018-12-18
• 2.6.0 - 2018-12-05
• 2.5.7 - 2018-05-26

from core-js GitHub release notes

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