Bump core-js from 2.5.7 to 2.6.0 in /ui

[dependabot-preview]

Bumps core-js from 2.5.7 to 2.6.0.

Release notes

Sourced from core-js's releases.

2.6.0 - 2018.12.05

• Add direct .exec calling to RegExp#{@[**replace**](https://github.com/replace), @[**split**](https://github.com/split), @[**match**](https://github.com/match), @[**search**](https://github.com/search)}. Also, added fixes for RegExp#exec method. #411, #428, #434, #435, #453, #458, thanks [nicolo-ribaudo](https://github.com/nicolo-ribaudo).

Changelog

Sourced from core-js's changelog.

2.6.0 - 2018.12.05

• Add direct .exec calling to RegExp#{@[**replace**](https://github.com/replace), @[**split**](https://github.com/split), @[**match**](https://github.com/match), @[**search**](https://github.com/search)}. Also, added fixes for RegExp#exec method. #428, #435, #458, thanks [nicolo-ribaudo](https://github.com/nicolo-ribaudo).

Commits

• f980318 2.6.0
• f0b4154 add es6.regexp.exec as a direct dependency of _fix-re-wks for prevent bre...
• a221e2a replace redefine by hide because of Chrome 38 bug with symbols conversion
• 41e41e9 add some caps for the library version
• 79db861 Merge pull request #458 from nicolo-ribaudo/backport-453
• b0a70f9 Backport 41a8b12c8e641061e3576f89023f0a8fa903b81b
• f77f88e Backport Bump ng2-charts from 2.0.4 to 2.2.0 in /ui #453
• 04b76e8 Merge pull request #435 from nicolo-ribaudo/backport-named-replace
• 2b102b7 Polyfll named groups in RegExp#@replace
• fd64c48 Merge pull request #428 from nicolo-ribaudo/backport-es2015-regex
• Additional commits viewable in compare view

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