Update babel to version 7

[namjul]

[codecov-io]

Codecov Report

Merging #28 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #28   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files           2        2           
  Lines         134      134           
  Branches       29       29           
=======================================
  Hits          131      131           
  Misses          3        3

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