Add plotting.max_rows

[charlesdong1991]

No description provided.

[HyukjinKwon]

Looks good otherwise.

[codecov-io]

Codecov Report

Merging #728 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #728      +/-   ##
=========================================
+ Coverage   94.24%   94.4%   +0.16%     
=========================================
  Files          32      32              
  Lines        5579    5580       +1     
=========================================
+ Hits         5258    5268      +10     
+ Misses        321     312       -9

Impacted Files	Coverage Δ
databricks/koalas/config.py	100% <ø> (ø)	⬆️
databricks/koalas/plot.py	94.91% <100%> (+1.12%)	⬆️
databricks/koalas/series.py	95.18% <0%> (+0.17%)	⬆️
databricks/koalas/frame.py	95.12% <0%> (+0.29%)	⬆️

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[HyukjinKwon]

Thanks for doing this, @charlesdong1991 ! merged.