Fix round to support multi-index columns.

[ueshin]

No description provided.

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Softagram Impact Report for pull/802 (head commit: 97c19e3)

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[codecov-io]

Codecov Report

Merging #802 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #802      +/-   ##
=========================================
+ Coverage    94.3%   94.3%   +<.01%     
=========================================
  Files          32      32              
  Lines        5828    5830       +2     
=========================================
+ Hits         5496    5498       +2     
  Misses        332     332

Impacted Files	Coverage Δ
databricks/koalas/frame.py	96.79% <100%> (ø)	⬆️

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[ueshin]

Thanks! merging.