add runningReduce()

[Anas35]

closes #153

[codecov]

Codecov Report

Merging #174 (9024a4f) into master (a34fbf4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #174   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files          40       40           
  Lines        1813     1822    +9     
=======================================
+ Hits         1796     1805    +9     
  Misses         17       17           

Flag	Coverage Δ
unittests	99.06% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
lib/src/collection/kt_iterable.dart	99.49% <100.00%> (+<0.01%)	⬆️

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[passsy]

Great work :)

Note that there is also an runningReduceIndexed version