use own isFunction, isPlainObject´ and isSymbol checks

[timche]

No description provided.

[codecov]

Codecov Report

Merging #312 into master will increase coverage by 0.21%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
+ Coverage      96%   96.21%   +0.21%     
==========================================
  Files          24       27       +3     
  Lines         125      132       +7     
  Branches       37       39       +2     
==========================================
+ Hits          120      127       +7     
  Misses          4        4              
  Partials        1        1

Impacted Files	Coverage Δ
src/combineActions.js	85.71% <ø> (ø)	⬆️
src/createActions.js	100% <ø> (ø)	⬆️
src/createAction.js	100% <ø> (ø)	⬆️
src/utils/flattenReducerMap.js	100% <ø> (ø)	⬆️
src/handleAction.js	100% <ø> (ø)	⬆️
src/handleActions.js	100% <ø> (ø)	⬆️
src/utils/isPlainObject.js	100% <100%> (ø)
src/utils/isSymbol.js	100% <100%> (ø)
src/utils/isFunction.js	100% <100%> (ø)
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8ae339c...d6aeba6. Read the comment docs.