Use matching data text as search text

[sigmike]

The current implementation expects an object as value when there's a dataSourceConfig. But the value is usually just a value, not an object containing the value and the text. So I believe when a value is provided and there's a dataSourceConfig the corresponding text should be looked up in the dataSource.

Maybe the case where the value is actually an object should be handled too, but I'm not sure it's a valid use case since the current behavior on change is to set only the value in the form data.

[codecov-io]

Codecov Report

Merging #141 into master will decrease coverage by 2.06%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   78.37%   76.31%   -2.07%     
==========================================
  Files          11       11              
  Lines          37       38       +1     
==========================================
  Hits           29       29              
- Misses          8        9       +1

Impacted Files	Coverage Δ
src/AutoComplete.js	42.85% <0%> (-7.15%)	⬇️

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[erikras]

LGTM.