Update CHANGELOGs and prepare rand 0.9.0-alpha.0 (rust-random#1395)

Also: add pull-request template

Author: dhardy

CHANGELOG.md

@@ -4,15 +4,26 @@ 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).
 
-## [0.5.0] - unreleased
+## [0.5.0-alpha.0] - 2024-02-18
+This is a pre-release. To depend on this version, use `rand_distr = "=0.5.0-alpha.0"` to prevent automatic updates (which can be expected to include breaking changes).
+
+### Additions
+- Make distributions comparable with `PartialEq` (#1218)
+- Add `WeightedIndexTree` (#1372)
+
+### Changes
+- Target `rand` version `0.9.0-alpha.0`
 - Remove unused fields from `Gamma`, `NormalInverseGaussian` and `Zipf` distributions (#1184)
   This breaks serialization compatibility with older versions.
-- Upgrade Rand
-- Fix Knuth's method so `Poisson` doesn't return -1.0 for small lambda
-- Fix `Poisson` distribution instantiation so it return an error if lambda is infinite
 - `Dirichlet` now uses `const` generics, which means that its size is required at compile time (#1292)
 - The `Dirichlet::new_with_size` constructor was removed (#1292)
 
+### Fixes
+- Fix Knuth's method so `Poisson` doesn't return -1.0 for small lambda (#1284)
+- Fix `Poisson` distribution instantiation so it return an error if lambda is infinite (#1291)
+- Fix Dirichlet sample for small alpha values to avoid NaN samples (#1209)
+- Fix infinite loop in `Binomial` distribution (#1325)
+
 ## [0.4.3] - 2021-12-30
 - Fix `no_std` build (#1208)
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rand_distr"
-version = "0.5.0"
+version = "0.5.0-alpha.0"
 authors = ["The Rand Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"
@@ -27,15 +27,15 @@ std_math = ["num-traits/std"]
 serde1 = ["serde", "rand/serde1"]
 
 [dependencies]
-rand = { path = "..", version = "0.9.0", default-features = false }
+rand = { path = "..", version = "=0.9.0-alpha.0", default-features = false }
 num-traits = { version = "0.2", default-features = false, features = ["libm"] }
 serde = { version = "1.0.103", features = ["derive"], optional = true }
 serde_with = { version = "3.6.1", optional = true }
 
 [dev-dependencies]
-rand_pcg = { version = "0.4.0", path = "../rand_pcg" }
+rand_pcg = { version = "=0.9.0-alpha.0", path = "../rand_pcg" }
 # For inline examples
-rand = { path = "..", version = "0.9.0", features = ["small_rng"] }
+rand = { path = "..", version = "=0.9.0-alpha.0", features = ["small_rng"] }
 # Histogram implementation for testing uniformity
 average = { version = "0.13", features = [ "std" ] }
 # Special functions for testing distributions