Add parameters specification for lyapunov exponents

[ErikQQY]

Part of #67

[codecov[bot]]

Codecov Report

Merging #69 (4c72af0) into master (1e10137) will decrease coverage by 0.02%. The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
- Coverage   74.86%   74.84%   -0.02%     
==========================================
  Files          40       40              
  Lines        3632     3634       +2     
==========================================
+ Hits         2719     2720       +1     
- Misses        913      914       +1     

Impacted Files	Coverage Δ
src/lyapunov.jl	71.96% <77.77%> (-0.11%)	:arrow_down:

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