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
-----------

 * First release, contains implementations for SI.