A compatibility layer for rand_core providing adaptation between traits for
each version.
Select the rand_core/rand versions you want to have compatibility between
using the crate features:
rand_core_0_5:rand_core 0.5/rand 0.7.rand_core_0_6:rand_core 0.6/rand 0.8.rand_core_0_9:rand_core 0.9/rand 0.9.
You then most likely want to wrap your RNG, e.g. of version rand_core 0.6/rand 0.8 in a [Rng06] struct. It'll implement the RngCore traits of
all the other versions you selected via features.