Add '.uniq' method

[dykov]

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[codecov]

Codecov Report

Merging #81 (5cf2540) into master (36571b3) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master       #81   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity        49        54    +5     
===========================================
  Files              5         5           
  Lines             95       108   +13     
  Branches          16        18    +2     
===========================================
+ Hits              95       108   +13     

Impacted Files	Coverage Δ
...java/io/github/dgroup/enumerable4j/Enumerable.java	100.00% <100.00%> (ø)

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[dgroup]

@rultor merge

[rultor]

@rultor merge

@dgroup OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@dgroup Done! FYI, the full log is here (took me 2min)