breaking(Dropdown): correct onSearchChange signature

[layershifter]

BREAKING

Fixes #2052.
Rel #1828.

Handler	Previous Signature	Current Signature
onSearchChange	(e, value)	(e, { ...props, searchQuery })

Before

<Dropdown onSearchChange={(e, value) => console.log(e, value)} />

After

<Dropdown onSearchChange={(e, data) => console.log(e, data.searchQuery)} />

[codecov-io]

Codecov Report

Merging #2102 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2102   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files         149      149           
  Lines        2598     2598           
=======================================
  Hits         2592     2592           
  Misses          6        6

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

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[levithomason]

Released in semantic-ui-react@0.74.0