chore(deps): update dependency babel-core to v6.26.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
babel-core	devDependencies	patch	6.26.0 -> 6.26.3	homepage, source

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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

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[coveralls]

Coverage remained the same at 100.0% when pulling 323113f on renovate/babel6-monorepo into 00d3fae on master.

[codecov]

Codecov Report

Merging #22 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #22   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          69     69           
  Branches       15     15           
=====================================
  Hits           69     69

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