Update babel-core to version 6.7.2 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

babel-core just published its new version 6.7.2, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of babel-core – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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This change is

[codecov-io]

Current coverage is 86.54%

Merging #566 into master will not affect coverage as of 3302b25

@@            master    #566   diff @@
======================================
  Files           97      97       
  Stmts          847     847       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit            733     733       
  Partial          0       0       
  Missed         114     114       

Review entire Coverage Diff as of 3302b25

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[bryk]

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from the review on Reviewable.io