Create A<V> to implement Arbitrary for all underlying storage types.

All `quickcheck` tests accept `A<V>` as parameters and `deref` into the
underling storage type. Allows for `quickcheck` tests for types that
don't implement `Arbitrary` by default. Part of #29.

CHANGELOG.md

@@ -22,7 +22,9 @@
    availability of the type as an underlying storage type: `usize`, `u8`, `u16`, `u32`, `u64`,
    `isize`, `i8`, `i16`, `i32`, `i64`, `bigint`, `biguint`, `rational`, `rational32`, `rational64`,
    `bigrational`, `f32`, and `f64`. For compile time reasons only `f32` and `f64` are enabled by
-   default.
+   default. Tests are implemented for all underlying storage types but don't account for minimum or
+   maximum values and will fail for non-float types where the conversion factor overflows the
+   type's limits. A future release will correct this.
  * [#29](https://github.com/iliekturtles/uom/issues/29) [Breaking] Traits and structs generated by
    the `system!` macro have been significantly changed in order to support non-float underlying
    storage types.

Cargo.toml

@@ -23,7 +23,7 @@ clippy = { version = "^0", optional = true }
 compiletest_rs = { version = "^0", optional = true }
 
 [dev-dependencies]
-quickcheck = "0.4.1"
+quickcheck = "0.5.0"
 approx = "0.1.1"
 
 [features]