Add textarea support

[andyrichardson]

Fix #24

[codecov-io]

Codecov Report

Merging #27 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   91.62%   91.71%   +0.09%     
==========================================
  Files           3        3              
  Lines         179      181       +2     
  Branches       62       63       +1     
==========================================
+ Hits          164      166       +2     
  Misses         12       12              
  Partials        3        3

Impacted Files	Coverage Δ
src/useField.ts	96.15% <100%> (+0.15%)	⬆️

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