logscale for animate_line()

[johnomotani]

Implement the logscale option in animate_line(). Means logscale works for line plots in BoutDataset.animate_list().

[codecov-commenter]

Codecov Report

Merging #255 (7088082) into master (d7cdd4b) will decrease coverage by 0.19%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   73.81%   73.62%   -0.20%     
==========================================
  Files          13       13              
  Lines        2517     2529      +12     
  Branches      600      615      +15     
==========================================
+ Hits         1858     1862       +4     
- Misses        437      440       +3     
- Partials      222      227       +5     

Impacted Files	Coverage Δ
xbout/plotting/animate.py	45.37% <25.00%> (-0.71%)	⬇️
xbout/boutdataset.py	76.84% <50.00%> (-0.23%)	⬇️
xbout/plotting/plotfuncs.py	48.27% <0.00%> (ø)

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