Version 2.0
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* Full re-organization of modules.
* Addition of US customary units, CGS units, and a few other gubbins.
Version 1.1
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* Added `si` parser.
* Moved `DefaultUnitOfDim` instances from `SI.MonoTypes` to `SI.Mono`. This allows
client code to import the monomorphic types without getting these instances. But,
it may mean that your imports have to change.
Version 1.0.1
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* Added derived SI units.
* Added British-spelled synonyms for SI units.
Version 1.0
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* First release, contains implementations for SI.