Adaptive Tolerance Variant of simulate_de

[ccoffrin]

@zmorrell this is what I propose.

[codecov]

Codecov Report

Merging #22 (5fd3c24) into main (99f4183) will decrease coverage by 4.22%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   96.83%   92.61%   -4.23%     
==========================================
  Files           5        5              
  Lines         443      474      +31     
==========================================
+ Hits          429      439      +10     
- Misses         14       35      +21     

Impacted Files	Coverage Δ
src/simulate_de.jl	77.55% <66.66%> (-22.45%)	⬇️
src/simulate.jl	87.83% <0.00%> (-6.76%)	⬇️

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[zmorrell]

This all looks good to me