Fix plot for multi-index columns.

[ueshin]

No description provided.

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Softagram Impact Report for pull/830 (head commit: 7984b1a)

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[codecov-io]

Codecov Report

Merging #830 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #830   +/-   ##
=======================================
  Coverage   94.36%   94.36%           
=======================================
  Files          32       32           
  Lines        5855     5855           
=======================================
  Hits         5525     5525           
  Misses        330      330

Impacted Files	Coverage Δ
databricks/koalas/plot.py	94.29% <100%> (ø)	⬆️

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[HyukjinKwon]

Also haven't taken a close look yet but seems fine

[ueshin]

Thanks! merging.