Prepare release 0.6.0

Prepare release 0.6.0, which includes doc strings for most of the public
API and a new `AttemptError` data class to represent a job error.

Author: brandur

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.6.0] - 2024-07-06
+
 ### Added
 
 - Add doc strings for most of the public API. [PR #27](https://github.com/riverqueue/riverqueue-python/pull/27).

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "riverqueue"
-version = "0.5.0"
+version = "0.6.0"
 description = "Python insert-only client for River."
 authors = [
     { name = "Eric Hauser", email = "[email protected]" },