Prepare 0.9.0rc0

CHANGELOG.md

@@ -26,9 +26,16 @@ Security in case of vulnerabilities.
 
 -->
 
-(changelog/unreleased)=
+<!-- (changelog/unreleased)= -->
 
-## [Unreleased]
+<!-- ## [Unreleased] -->
+
+## [0.9.0rc0]
+
+### Added
+
+- {class}`snek5000.output.spatial_means.SpatialMeans`.
+- New block `user_size` in `SIZE.j2` template (see {mod}`snek5000.resources`).
 
 ### Removed
 
@@ -350,6 +357,8 @@ lists are a very incomplete lists of the additions, changes and deprecations.
 - Python packaging
 - Sphinx + Doxygen + Breathe documentation
 
+<!-- [unreleased]: https://github.com/snek5000/snek5000/compare/0.8.0...HEAD -->
+
 [0.0.1]: https://github.com/snek5000/snek5000/releases/tag/0.0.1
 [0.1.0]: https://github.com/snek5000/snek5000/compare/0.0.1...0.1.0
 [0.1.1]: https://github.com/snek5000/snek5000/compare/0.1.0...0.1.1
@@ -366,5 +375,5 @@ lists are a very incomplete lists of the additions, changes and deprecations.
 [0.6.1b0]: https://github.com/snek5000/snek5000/compare/0.6.0b0...0.6.1b0
 [0.7.0b0]: https://github.com/snek5000/snek5000/compare/0.6.1b0...0.7.0b0
 [0.8.0]: https://github.com/snek5000/snek5000/compare/0.7.0b0...0.8.0
+[0.9.0rc0]: https://github.com/snek5000/snek5000/compare/0.8.0...0.9.0rc0
 [@paugier]: https://github.com/paugier
-[unreleased]: https://github.com/snek5000/snek5000/compare/0.8.0...HEAD