Add support for Reducer interface inheritance

[codecov-io]

Codecov Report

Merging #36 into master will increase coverage by 0.15%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     91.47%   91.62%   +0.15%     
- Complexity      206      207       +1     
============================================
  Files            27       27              
  Lines           774      776       +2     
  Branches         90       91       +1     
============================================
+ Hits            708      711       +3     
+ Misses           47       46       -1     
  Partials         19       19

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/yheriatovych/reductor/processor/Utils.java	89.28% <100%> (+4.67%)	11 <0> (+1)	:arrow_up:

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[Yarikx]

Hi @marekoid

Thanks for your contribution. That's a good point about superinterface. Will merge it and release in next version

[marekoid]

Cheers Yaroslav!