Update babel-core requirement to 6.26.3

[dependabot-preview]

Updates the requirements on babel-core to permit the latest version.

Changelog

Sourced from babel-core's changelog.

Changelog

Tags:

• 💥 [Breaking Change]
• 👓 [Spec Compliancy]
• 🚀 [New Feature]
• 🐛 [Bug Fix]
• 📝 [Documentation]
• 🏠 [Internal]
• 💅 [Polish]

Note: Gaps between patch versions are faulty, broken or test releases.

See CHANGELOG - 6to5 for the pre-4.0.0 version changelog.
See Babylon's CHANGELOG for the Babylon pre-7.0.0-beta.29 version changelog.

6.26.0 (2017-08-16)

Backports for some folks (also other's when we accidently merged PRs from both 6.x/master)
Lesson learned: just use master and backport on another branch.

👓 Spec Compliancy

• babel-core, babel-generator, babel-plugin-transform-flow-comments, babel-plugin-transform-flow-strip-types, babel-traverse, babel-types
  • #6081 Flow opaque type 6.x backport. ([jbrown215](https://github.com/jbrown215))

🚀 New Feature

• babel-cli
  • #5796 Allow --inspect-brk option to be used with babel-node [6.x backport]. ([noinkling](https://github.com/noinkling))

🐛 Bug Fix

• babel-plugin-transform-es2015-modules-commonjs
  • #5811 Fix 5768. ([joshwnj](https://github.com/joshwnj))
  • #5469 Fix commonjs exports with destructuring.. ([yavorsky](https://github.com/yavorsky))
• babel-types
  • #5693 Hoist toSequenceExpression's convert helper. ([jridgewell](https://github.com/jridgewell))

📝 Documentation

• babel-plugin-transform-class-properties
  • #6005 FIX access to the prototype of an instance. ([shuaibird](https://github.com/shuaibird))
• babel-plugin-transform-runtime
  • #5857 Fix typos in README.md. ([danny-andrews](https://github.com/danny-andrews))
• babel-plugin-transform-regenerator
  • #5852 Fix babel-plugin-transform-regenerator README. ([k15a](https://github.com/k15a))
• Other
  • #5788 Add a section on troubleshooting [skip ci]. ([peey](https://github.com/peey))
  • #5755 Fix broken tables in README.md. ([u9lyfish](https://github.com/u9lyfish))
• babel-generator, babel-plugin-transform-es2015-arrow-functions, babel-plugin-transform-es2015-modules-commonjs, babel-plugin-transform-es2015-spread, babel-plugin-transform-runtime, babel-register
  • #5613 Backport doc changes. ([xtuc](https://github.com/xtuc))

🏠 Internal

... (truncated)

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