Fixed some bugs using final-form's new forceUpdate flag

[erikras]

This fixes a variety of bugs, some, but not all listed here: final-form/react-final-form-arrays#66

[codecov]

Codecov Report

Merging #32 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #32   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          11     10    -1     
  Lines         138    139    +1     
  Branches       27     27           
=====================================
+ Hits          138    139    +1

Impacted Files	Coverage Δ
src/push.js	100% <100%> (ø)	⬆️
src/pop.js	100% <100%> (ø)	⬆️
src/removeBatch.js	100% <100%> (ø)	⬆️
src/move.js	100% <100%> (ø)	⬆️
src/unshift.js	100% <100%> (ø)	⬆️
src/swap.js	100% <100%> (ø)	⬆️
src/concat.js	100% <100%> (ø)	⬆️
src/update.js	100% <100%> (ø)	⬆️
src/insert.js	100% <100%> (ø)	⬆️
src/remove.js	100% <100%> (ø)	⬆️

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