fix(Input): add typings update

[layershifter]

Input is a class component.

[codecov-io]

Codecov Report

Merging #1820 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1820   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files         144      144           
  Lines        2463     2463           
=======================================
  Hits         2457     2457           
  Misses          6        6

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[levithomason]

Released in semantic-ui-react@0.71.0.