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ndarray-rand doesn't work with rand 0.7 #658

Description

@ngoldbaum

The test program in the ndarray-rand documentation doesn't compile with rand 0.7:

main.rs:

use ndarray::Array;
use ndarray_rand::RandomExt;
use rand::distributions::Uniform;

fn main() {
    let a = Array::random((2, 5), Uniform::new(0., 10.));
    println!("{:8.4}", a);
}

cargo.toml:

[package]
name = "rand-test"
version = "0.1.0"
authors = ["Nathan Goldbaum <nathan12343@gmail.com>"]
edition = "2018"

[dependencies]
ndarray = { version = "0.12", features = ["blas"] }
ndarray-rand = "0.9"
rand = "0.7"

compile error:

    Updating crates.io index
   Compiling rand-test v0.1.0 (/home/goldbaum/Documents/rand-test)
error[E0277]: the trait bound `rand::distributions::uniform::Uniform<{float}>: rand::distributions::Distribution<_>` is not satisfied
 --> src/main.rs:6:13
  |
6 |     let a = Array::random((2, 5), Uniform::new(0., 10.));
  |             ^^^^^^^^^^^^^ the trait `rand::distributions::Distribution<_>` is not implemented for `rand::distributions::uniform::Uniform<{float}>`
  |
  = note: required by `ndarray_rand::RandomExt::random`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: Could not compile `rand-test`.

It works if I specify rand = "0.6" in cargo.toml.

Apologies if this issue is documented already and I've missed it.

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