Miles per hour

[fabiengagne]

Currently in version 2.3.0 the symbol for miles per hour is "mi/h". However people usually refer to "mph". Could you change it to "mph" ?

How to reproduce:
Unitwise(10, "[mi_i]/h").to_s(:symbol)
=> "10 mi/h"

Expected result:
Unitwise(10, "[mi_i]/h").to_s(:symbol)
=> "10 mph"

[stevegeek]

I guess we could add it as a new derived unit