We’ve written a blog post summarizing the changes in this release: Crystal 0.36.1 released! - The Crystal Programming Language
The full changelog is here: Release 0.36.1 · crystal-lang/crystal · GitHub
Note that this release will be available in the new apt and rpm repositories post, as well as GitHub release artifacts. You might need to update your package repositories. Like we need to do in the Install - The Crystal Programming Language pages 
Docker images and 64 bits Linux packages are available as usual
The brew formula PR is in crystal 0.36.1 by bcardiff · Pull Request #70236 · Homebrew/homebrew-core · GitHub