Bump core-js from 2.5.3 to 2.5.6

[dependabot-preview]

Bumps core-js from 2.5.3 to 2.5.6.

Release notes

Sourced from core-js's releases.

2.5.6 - 2018.05.07

• Forced replace native Promise in V8 6.6 (Node 10 and Chrome 66) because of a bug with resolving custom thenables
• Added a workaround for usage buggy native LG WebOS 2 Promise in microtask implementation, #396
• Added modern version internal debugging information about used versions

2.5.5 - 2018.04.08

• Fix some edge cases of Reflect.set, #392 and #393

2.5.4 - 2018.03.27

• Fixed one case of deoptimization built-in iterators in V8, related #377
• Fixed some cases of iterators feature detection, #368
• Fixed manually entered NodeJS domains issue in Promise, #367
• Fixed Number.{parseInt, parseFloat} entry points
• Fixed __(define|lookup)[GS]etter__ export in the library version

Changelog

Sourced from core-js's changelog.

2.5.6 - 2018.05.07

• Forced replace native Promise in V8 6.6 (Node 10 and Chrome 66) because of a bug with resolving custom thenables
• Added a workaround for usage buggy native LG WebOS 2 Promise in microtask implementation, #396

2.5.5 - 2018.04.08

• Fix some edge cases of Reflect.set, #392 and #393

2.5.4 - 2018.03.27

• Fixed one case of deoptimization built-in iterators in V8, related #377
• Fixed some cases of iterators feature detection, #368
• Fixed manually entered NodeJS domains issue in Promise, #367
• Fixed Number.{parseInt, parseFloat} entry points
• Fixed __(define|lookup)[GS]etter__ import in the library version

Commits

• c31ae34 2.5.6
• 3bbe23d add modern version internal debugging information about used versions
• cfd9371 add a webos-related comment
• 1e8a890 fix v8 6.6 (Node 10 and Chrome 66) Promise bug with resolving custom thenables
• 3520378 fix #396
• 7902263 2.5.5
• 8a6e82a fix #392, #393
• b34b0c3 2.5.4
• 3119c26 fix one case of built-in iterators deoptimization in V8, related #377
• c77b93a revert zloirock/core-js@e1ffbae3e18730072be48c82807...
• Additional commits viewable in compare view

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