fix(Input): update supported values for the size prop

[layershifter]

Fixes #3439.

This PR updates supported values for the size prop, see input.css.

[codecov-io]

Codecov Report

Merging #3444 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3444   +/-   ##
=======================================
  Coverage   99.92%   99.92%           
=======================================
  Files         172      172           
  Lines        2838     2838           
=======================================
  Hits         2836     2836           
  Misses          2        2

Impacted Files	Coverage Δ
src/elements/Input/Input.js	100% <ø> (ø)	⬆️

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[levithomason]

Released in semantic-ui-react@0.86.0.

[woozyking]

Would this be a breaking change, since previously there was medium size supported?

This came up only when we ran some snapshot testing on our data table component, as seen https://travis-ci.com/EQWorks/extended-semantic-components/builds/105847120