Add `#[allow(non_camel_case_types)]` on `Units`'s base quantity associated types.
Add `#[allow(non_camel_case_types)]` on `Units`'s base quantity associated types.

Recent versions of Rust started warning about non camel case associated
types. A future commit may remove this attribute and rename the base
quantities to use camel case.

iliekturtles/uom