Prepare version 0.3.0

Tee up version 0.3.0, whose largest feature is a full implementation of
`insert_many()` and `insert_many_tx()` [1].

[1] #22

Author: brandur

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0] - 2024-07-04
+
 ### Added
 
 - Implement `insert_many` and `insert_many_tx`. [PR #22](https://github.com/riverqueue/river/pull/22).

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "riverqueue"
-version = "0.2.0"
+version = "0.3.0"
 description = "Python insert-only client for River."
 authors = [
     { name = "Eric Hauser", email = "[email protected]" },