Update CHANGELOG

Author: dhardy

CHANGELOG.md

@@ -18,6 +18,7 @@ You may also find the [Upgrade Guide](https://rust-random.github.io/book/update.
 - Enable feature `small_rng` by default (#1455)
 - Allow `UniformFloat::new` samples and `UniformFloat::sample_single` to yield `high` (#1462)
 - Fix portability of `rand::distributions::Slice` (#1469)
+- Rename `rand::distributions` to `rand::distr` (#1470)
 
 ## [0.9.0-alpha.1] - 2024-03-18
 - Add the `Slice::num_choices` method to the Slice distribution (#1402)