compat with Plots v2

[t-bltg]

See JuliaPlots/Plots.jl#4904.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 18 lines in your changes missing coverage. Please review.

Please upload report for BASE (v2@e34f65e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/boxplot.jl	0.00%	4 Missing ⚠️
src/hist.jl	42.85%	4 Missing ⚠️
src/violin.jl	0.00%	3 Missing ⚠️
src/cornerplot.jl	0.00%	2 Missing ⚠️
src/corrplot.jl	0.00%	2 Missing ⚠️
src/dotplot.jl	0.00%	2 Missing ⚠️
src/bar.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             v2     #558   +/-   ##
=====================================
  Coverage      ?   26.28%           
=====================================
  Files         ?       20           
  Lines         ?     1248           
  Branches      ?        0           
=====================================
  Hits          ?      328           
  Misses        ?      920           
  Partials      ?        0           

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