Code Clean up

[vish288]

Indentation consistency
Removal of Lint issues.
Es6 literal usage.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@539dab5). Click here to learn what that means.
The diff coverage is 90.47%.

@@            Coverage Diff            @@
##             master     #257   +/-   ##
=========================================
  Coverage          ?   82.55%           
=========================================
  Files             ?        5           
  Lines             ?      149           
  Branches          ?        0           
=========================================
  Hits              ?      123           
  Misses            ?       26           
  Partials          ?        0

Impacted Files	Coverage Δ
src/defaults.js	75% <ø> (ø)
src/diff.js	100% <100%> (ø)
src/helpers.js	100% <100%> (ø)
src/index.js	87.09% <85%> (ø)
src/core.js	73.33% <92.85%> (ø)

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[vish288]

updated the code to include the commit from https://github.com/mfeniseycopes/redux-logger/tree/refactor as well. #223

[vish288]

@evgenyrodionov : The issue seems to be with codecov.io not having a comparison.
Apart from that could you comment on the code pls?