Update optimization.jl

[danielsimm]

add parameter combination for 4 and 5 parameters #26

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.32%. Comparing base (017c23a) to head (6a50a79).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #27 +/- ## ========================================== + Coverage 82.09% 82.32% +0.23% ========================================== Files 9 9 Lines 726 730 +4 ========================================== + Hits 596 601 +5 + Misses 130 129 -1 ```

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[maltepuetz]

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Release notes:

Minor changes:

• updated optimization.jl to work with an arbitrary number of parameters (previously limited to 3)

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