remove lodash dependencies

[timche]

Before

After

[codecov]

Codecov Report

Merging #307 into master will increase coverage by 0.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #307      +/-   ##
==========================================
+ Coverage   95.61%   95.96%   +0.35%     
==========================================
  Files          14       24      +10     
  Lines         114      124      +10     
  Branches       36       37       +1     
==========================================
+ Hits          109      119      +10     
  Misses          4        4              
  Partials        1        1

Impacted Files	Coverage Δ
src/handleActions.js	100% <ø> (ø)	⬆️
src/utils/flattenWhenNode.js	100% <ø> (ø)	⬆️
src/combineActions.js	85.71% <ø> (ø)	⬆️
src/createCurriedAction.js	100% <ø> (ø)	⬆️
src/utils/ownKeys.js	50% <ø> (ø)	⬆️
src/utils/camelCase.js	100% <ø> (ø)	⬆️
src/createAction.js	100% <ø> (ø)	⬆️
src/utils/flattenReducerMap.js	100% <ø> (ø)	⬆️
src/utils/unflattenActionCreators.js	100% <ø> (ø)	⬆️
src/utils/isMap.js	100% <100%> (ø)
... and 21 more

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