CLN: ASV plotting

[mroeschke]

Flake8'd and simplified some of the setup.

$ asv dev -b ^plotting
· Discovering benchmarks
· Running 6 total benchmarks (1 commits * 1 environments * 6 benchmarks)
[  0.00%] ·· Building for existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[  0.00%] ·· Benchmarking existing-py_home_matt_anaconda_envs_pandas_dev_bin_python
[ 16.67%] ··· Running plotting.Misc.time_plot_andrews_curves              1.92s
[ 33.33%] ··· Running plotting.Plotting.time_frame_plot                   417ms
[ 50.00%] ··· Running plotting.Plotting.time_series_plot                  418ms
[ 66.67%] ··· Running ...ting.TimeseriesPlotting.time_plot_irregular      130ms
[ 83.33%] ··· Running plotting.TimeseriesPlotting.time_plot_regular       388ms
[100.00%] ··· Running ...TimeseriesPlotting.time_plot_regular_compat      123ms

[codecov]

Codecov Report

Merging #18916 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18916   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         154      154           
  Lines       51368    51368           
=======================================
  Hits        47080    47080           
  Misses       4288     4288

Flag	Coverage Δ
#multiple	89.52% <ø> (ø)	⬆️
#single	40.84% <ø> (ø)	⬆️

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[jreback]

thanks!