allow fixing alt parameters

[aloctavodia]

Closes #140

[codecov-commenter]

Codecov Report

Merging #150 (f186348) into main (3e8a783) will decrease coverage by 1.15%.
The diff coverage is 89.89%.

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   77.26%   76.11%   -1.16%     
==========================================
  Files          18       18              
  Lines        2173     2252      +79     
==========================================
+ Hits         1679     1714      +35     
- Misses        494      538      +44     

Impacted Files	Coverage Δ
preliz/tests/test_distributions.py	100.00% <ø> (ø)
preliz/tests/test_maxent.py	100.00% <ø> (ø)
preliz/distributions/continuous.py	93.75% <88.46%> (-4.91%)	⬇️
preliz/utils/optimization.py	82.63% <90.00%> (+0.12%)	⬆️
preliz/distributions/discrete.py	99.41% <97.67%> (+5.18%)	⬆️

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