Fix plotting

[HDembinski]

No description provided.

[codecov]

Codecov Report

Merging #361 into develop will increase coverage by 0.29%.
The diff coverage is 94.8%.

@@             Coverage Diff             @@
##           develop     #361      +/-   ##
===========================================
+ Coverage    65.68%   65.98%   +0.29%     
===========================================
  Files          138      139       +1     
  Lines         4433     4469      +36     
  Branches       651      651              
===========================================
+ Hits          2912     2949      +37     
+ Misses        1283     1282       -1     
  Partials       238      238

Impacted Files	Coverage Δ
iminuit/latex.py	88.79% <100%> (+0.09%)	⬆️
iminuit/color.py	100% <100%> (ø)	⬆️
iminuit/repr_html.py	96.94% <66.66%> (+0.01%)	⬆️
iminuit/_deprecated.py	90% <90%> (ø)
iminuit/_minuit_methods.py	94.89% <94.28%> (+2.42%)	⬆️

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