Prepare rand_distr v0.4.0 release

Author: dhardy

rand_distr/CHANGELOG.md

@@ -4,7 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.4.0] - 2020-12-18
+- Bump `rand` to v0.8.0
 - New `Geometric`, `StandardGeometric` and `Hypergeometric` distributions (#1062)
 - New `Beta` sampling algorithm for improved performance and accuracy (#1000)
 - `Normal` and `LogNormal` now support `from_mean_cv` and `from_zscore` (#1044)

rand_distr/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rand_distr"
-version = "0.2.2"
+version = "0.4.0"
 authors = ["The Rand Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"