update changelog

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## [0.21.18] - 2024-12-12
+
 - Allow for user defined recipes to be used in SpecApi [#4655](https://github.com/MakieOrg/Makie.jl/pull/4655).
 
 ## [0.21.17] - 2024-12-05
@@ -685,7 +687,8 @@ All other changes are collected [in this PR](https://github.com/MakieOrg/Makie.j
 - Fixed rendering of `heatmap`s with one or more reversed ranges in CairoMakie, as in `heatmap(1:10, 10:-1:1, rand(10, 10))` [#1100](https://github.com/MakieOrg/Makie.jl/pull/1100).
 - Fixed volume slice recipe and added docs for it [#1123](https://github.com/MakieOrg/Makie.jl/pull/1123).
 
-[Unreleased]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.17...HEAD
+[Unreleased]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.18...HEAD
+[0.21.18]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.17...v0.21.18
 [0.21.17]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.16...v0.21.17
 [0.21.16]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.15...v0.21.16
 [0.21.15]: https://github.com/MakieOrg/Makie.jl/compare/v0.21.14...v0.21.15