Update babel monorepo

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
babel-core (source)	devDependencies	minor	6.25.0 -> 6.26.3
babel-loader	devDependencies	patch	7.1.1 -> 7.1.5
babel-plugin-transform-es2015-modules-commonjs	devDependencies	minor	6.24.1 -> 6.26.2
babel-plugin-transform-object-rest-spread	devDependencies	minor	6.23.0 -> 6.26.0

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Release Notes

babel/babel

v6.26.3

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Summary

• Fixed a small regression from the backport of #​7761 from #​7812 if the output file contains no JS content

v6.26.2

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Summary

• Landed #​7812 which backported several fixes to make sourcemaps behave better
  • #​7312 - Include better mappings for arrow-transformed 'this' and 'arguments'
  • #​7378 - Include better mappings for import bindings transformed to member expressions
  • #​7761 - Re-implement inputSourceMap merging logic to more accurately reflect mappings

v6.26.0

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babel/babel-loader

v7.1.5

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v7.1.5

• Perf: Use md4 instead of sha1 for filename hashes (#​638)

v7.1.4

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🐛 Bug Fix

• Update code to read filename

v7.1.3

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🐛 Bug Fix

• Support webpack 4

v7.1.2

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🐛 Bug Fix

• Add the message in BabelLoaderError's stack trace on node 8 (#​499) (Stephen Jennings)
• Do not swallow errors in exists() and only call exists if option is string (#​495) (Nelo Mitranim)

📝 Documentation

• README: fix typo (#​498) (Piper Chester)

🏠 Internal

• Update ava to the latest version 🚀 (#​500) (greenkeeper[bot])
• Update ava to the latest version 🚀 (#​491) (greenkeeper[bot])
• Update ava to the latest version 🚀 (#​487) (greenkeeper[bot])

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