Add setFieldState call to useField on validation change

[andyrichardson]

About

Fix #235

Notes

• ~Need to confirm whether reducer will rerender on object equality (hopefully not the case)~ We good

[codecov-commenter]

Codecov Report

Merging #278 into master will decrease coverage by 0.95%. The diff coverage is 80.95%.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
- Coverage   91.51%   90.55%   -0.96%     
==========================================
  Files           3        3              
  Lines         165      180      +15     
  Branches       56       62       +6     
==========================================
+ Hits          151      163      +12     
- Misses         11       14       +3     
  Partials        3        3              

Impacted Files	Coverage Δ
src/useField.ts	91.11% <75.00%> (-6.04%)	:arrow_down:
src/useForm.ts	90.07% <88.88%> (+0.39%)	:arrow_up:

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[andyrichardson]

Shoutout to @JoviDeCroock for feedback on this ❤️