prepare the release: update changelog and blog post date

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [unpublished]
 
+## [v0.4.0]
+
 ### New scheduling algorithm
 
 * FINAM uses a new scheduling algorithm that allows components to use future data instead of only past/current (!157, !159)
@@ -171,6 +173,7 @@
 * initial release of FINAM
 
 [unpublished]: https://git.ufz.de/FINAM/finam/-/compare/v0.4.0-rc.2...main
+[v0.4.0]: https://git.ufz.de/FINAM/finam/-/compare/v0.4.0-rc.2...v0.4.0
 [v0.4.0-rc.2]: https://git.ufz.de/FINAM/finam/-/compare/v0.4.0-rc.1...v0.4.0-rc.2
 [v0.4.0-rc.1]: https://git.ufz.de/FINAM/finam/-/compare/v0.3.0...v0.4.0-rc.1
 [v0.3.0]: https://git.ufz.de/FINAM/finam/-/compare/v0.2.0...v0.3.0

docs/source/blog/posts/release-0-4-0.rst

-.. post:: 27 Oct, 2022
+.. post:: 4 Jan, 2023
     :tags: announcement
     :category: Release
     :author: Martin Lange
@@ -8,7 +8,7 @@
 FINAM 0.4 released
 ==================
 
-After three months of hard work since the last release, FINAM 0.4 comes with a full load of new features
+After more than three months of hard work since the last release, FINAM 0.4 comes with a full load of new features
 and usability improvements. This version is a real breakthrough in the development of FINAM!
 
 Highlights are a new scheduling algorithm, grid data types, automatic metadata and units handling,