bump cov - more PyPlot exs

[t-bltg]

• nearly all PyPlot disabled examples are ok now;
• bump coverage (:tired_face:, never enough), add more tests.

[codecov]

Codecov Report

Base: 87.38% // Head: 88.32% // Increases project coverage by +0.94% 🎉

Coverage data is based on head (1ad79de) compared to base (db6049f).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4469      +/-   ##
==========================================
+ Coverage   87.38%   88.32%   +0.94%     
==========================================
  Files          40       40              
  Lines        7941     7863      -78     
==========================================
+ Hits         6939     6945       +6     
+ Misses       1002      918      -84     

Impacted Files	Coverage Δ
src/examples.jl	98.33% <ø> (+10.27%)	⬆️
src/recipes.jl	79.70% <ø> (+4.34%)	⬆️
src/axes.jl	87.79% <50.00%> (+1.40%)	⬆️
src/backends/gr.jl	89.92% <61.11%> (-0.01%)	⬇️
src/components.jl	90.07% <80.00%> (+0.93%)	⬆️
src/animation.jl	96.19% <100.00%> (+6.47%)	⬆️
src/layouts.jl	90.82% <0.00%> (+0.29%)	⬆️
src/plot.jl	97.05% <0.00%> (+2.94%)	⬆️
... and 3 more

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