Update changelog

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d65c5e4396c073a26ad6ed3cf3e7810517a59867..e1443de810336d63ea5df649399046d8e22ad95a 100644 (file)
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog][] and this project adheres to
 [Semantic Versioning]: http://semver.org/
 
 ## Unreleased
+
+## 0.4.0 - 2020-05-26
 ### Added
 - 3D grid extension.
 - Uniform sampling. (Normal sampling is still default.)