Bump changelog and version

Author: WarmCyan

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://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] - 2023-08-18
 
 ### Added
 * "All" tab in data manager to allow searching through entire dataset.

icat/__init__.py

@@ -17,4 +17,4 @@
 # make the important things directly accessible off top level module
 from icat.model import Model
 
-__version__ = "0.3.0"
+__version__ = "0.4.0"