add some steroid hormones to definitions.units

[delan]

This commit defines some of the more important sex hormones and their precursors, to make it easier to convert their levels between density (as preferred in the US) and molar_concentration (as preferred in Australia) without remembering any formulas.

[whitequark]

:+1:

[codecov[bot]]

Codecov Report

Merging #46 into master will decrease coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   82.91%   82.88%   -0.04%     
==========================================
  Files          20       20              
  Lines        4859     4854       -5     
==========================================
- Hits         4029     4023       -6     
- Misses        830      831       +1

Impacted Files	Coverage Δ
src/substance.rs	47.46% <0%> (-0.27%)	:arrow_down:
src/number.rs	88.71% <0%> (-0.23%)	:arrow_down:
src/date.rs	96.2% <0%> (-0.21%)	:arrow_down:
src/reply.rs	69.8% <0%> (-0.15%)	:arrow_down:
src/eval.rs	78.95% <0%> (-0.09%)	:arrow_down:
src/load.rs	82.58% <0%> (+0.32%)	:arrow_up:
src/value.rs	72.11% <0%> (+0.96%)	:arrow_up:

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[furudean]

powerful