Used resetFieldState to fix insert and unshift bugs

[erikras]

Fixes #21, and a few other bugs.

Requires [email protected].

[codecov]

Codecov Report

Merging #34 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #34   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     11    +1     
  Lines         145    147    +2     
  Branches       29     29           
=====================================
+ Hits          145    147    +2

Impacted Files	Coverage Δ
src/move.js	100% <ø> (ø)	⬆️
src/removeBatch.js	100% <100%> (ø)	⬆️
src/insert.js	100% <100%> (ø)	⬆️
src/remove.js	100% <100%> (ø)	⬆️
src/shift.js	100% <0%> (ø)

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[erikras]

Published in v3.0.0.