compound instead of union

[shimwell]

attempt to fix bug reported in issue #270

[codecov]

Codecov Report

Merging #271 (d260ce6) into develop (6d4d78a) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #271      +/-   ##
===========================================
+ Coverage    96.30%   96.48%   +0.18%     
===========================================
  Files           82       82              
  Lines         5523     5524       +1     
===========================================
+ Hits          5319     5330      +11     
+ Misses         204      194      -10     

Impacted Files	Coverage Δ
...amak/parametric_components/dished_vacuum_vessel.py	82.50% <100.00%> (+0.44%)	⬆️
src/paramak/shape.py	97.41% <0.00%> (+0.34%)	⬆️
src/paramak/utils.py	94.87% <0.00%> (+2.15%)	⬆️

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