[Snyk] Upgrade core-js from 2.5.5 to 2.6.10

[snyk-bot]

Snyk has created this PR to upgrade core-js from 2.5.5 to 2.6.10.

• The recommended version is 42 versions ahead of your current version.
• The recommended version was released 8 days 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

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        <b>2.6.6</b> - <a href="">2019-05-19</a>
        
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        <b>2.6.5</b> - <a href="">2019-02-15</a>
        
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        <b>2.6.4</b> - <a href="">2019-02-07</a>
        
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        <b>2.6.3</b> - <a href="">2019-01-22</a>
        
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        <b>2.6.2</b> - <a href="">2019-01-10</a>
        
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        <b>2.6.1</b> - <a href="">2018-12-18</a>
        
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        <b>2.6.0</b> - <a href="">2018-12-05</a>
        
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        <b>2.5.7</b> - <a href="">2018-05-26</a>
        
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        <b>2.5.6</b> - <a href="">2018-05-07</a>
        
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        <b>2.5.5</b> - <a href="">2018-04-09</a>
        
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  from [`core-js` GitHub Release Notes](https://github.com/zloirock/core-js/releases)

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