Adding some notes to help my understanding

[cscherrer]

[codecov-io]

Codecov Report

Merging #10 (cb33bf5) into master (a3fc9cf) will increase coverage by 0.48%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   51.89%   52.38%   +0.48%     
==========================================
  Files           8        8              
  Lines         237      231       -6     
==========================================
- Hits          123      121       -2     
+ Misses        114      110       -4     

Impacted Files	Coverage Δ
src/evolution.jl	69.56% <ø> (ø)
src/combinators.jl	50.90% <33.33%> (+1.72%)	:arrow_up:

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