Changing size of plot for diffusion example

[cncastillo]

juliahealth.org/KomaMRI.jl/previews/PR491

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.77%. Comparing base (b4e73ab) to head (94f291b).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #491   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files          54       54           
  Lines        3002     3002           
=======================================
  Hits         2725     2725           
  Misses        277      277           

Flag	Coverage Δ
base	87.07% <ø> (ø)
core	93.20% <ø> (ø)
files	91.69% <ø> (ø)
komamri	93.98% <ø> (ø)
plots	92.95% <ø> (ø)

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