Add preact support

[andyrichardson]

About

Fix #299

[codecov-io]

Codecov Report

Merging #300 (a4e6ca2) into master (d9a240b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   89.45%   89.45%           
=======================================
  Files          12       12           
  Lines         256      256           
  Branches       57       57           
=======================================
  Hits          229      229           
  Misses         26       26           
  Partials        1        1           

Impacted Files	Coverage Δ
src/actions/setFieldState.ts	77.77% <ø> (ø)
src/actions/setFieldValue.ts	66.66% <ø> (ø)
src/useField.ts	97.56% <ø> (ø)
src/useForm.ts	93.02% <100.00%> (ø)

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