Fix unique to support multi-index columns.

[ueshin]

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Softagram Impact Report for pull/809 (head commit: 76da3ce)

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[codecov-io]

Codecov Report

Merging #809 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #809      +/-   ##
==========================================
+ Coverage   94.32%   94.32%   +<.01%     
==========================================
  Files          32       32              
  Lines        5829     5830       +1     
==========================================
+ Hits         5498     5499       +1     
  Misses        331      331

Impacted Files	Coverage Δ
databricks/koalas/series.py	95.17% <100%> (ø)	⬆️

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