Bump babel minimums; remove over 100kb from bundles!

[cdrini]

Remove ie 11, opera mini, iOS9 ; no longer supported by archive.org and currently not working.

Deploy with care ; because of these we were basically getting every polyfill. Even though these 3 specific version are no longer supported, removing their polyfills could cause other browsers to break, so: deploy with care.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.30%. Comparing base (2d19d55) to head (4e02ac0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1323   +/-   ##
=======================================
  Coverage   69.30%   69.30%           
=======================================
  Files          59       59           
  Lines        5082     5082           
  Branches     1069     1069           
=======================================
  Hits         3522     3522           
  Misses       1533     1533           
  Partials       27       27           

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