fix(Flex): Forwards ref to children

[mathewmorris]

Was having an issue where if the component had a ref passed to it, it would be ignored since it was a functional component.

This will pass ref through.

[codecov]

Codecov Report

Merging #75 into v5 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v5      #75   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files          20       20           
  Lines         450      450           
  Branches       91       91           
=======================================
  Hits          300      300           
  Misses        120      120           
  Partials       30       30

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