Add missing changelog entry

riscv-rt/CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Add FPU initialization
 - New GitHub workflow for checking invalid labels in PRs
 - New GitHub workflow for checking modifications on CHANGELOG.md
 - New GitHub workflow for checking clippy lints in PRs