Prepare v0.50.2 release

Signed-off-by: Johan Fylling <johan.dev@fylling.se>

CHANGELOG.md

@@ -3,6 +3,25 @@
 All notable changes to this project will be documented in this file. This
 project adheres to [Semantic Versioning](http://semver.org/).
 
+## 0.50.2
+
+This is a bug fix release that addresses a regression in 0.50.1. 
+This regression impacts policies with rules that, as its else-value, assign a comprehension containing variables.
+Such rules would cause the compilation of the policy to fail with a `rego_unsafe_var_error` error.
+
+E.g. the following policy would fail to compile with a `policy.rego:5: rego_unsafe_var_error: var x is unsafe` error:
+```rego
+package example
+
+p {
+	false
+} else := [x | x := 1]
+```
+
+### Fixes
+
+- ast: Fixing bug where comprehensions in rule else-heads weren't rewritten correctly ([#5771](https://github.com/open-policy-agent/opa/issues/5771)) authored by @johanfylling reported by @davidmdm
+
 ## 0.50.1
 
 This is a bug fix release addressing the following issues: