This patch is just the vendor import. This has not changed anything in the src tree yet.
The release note is available here: https://github.com/vstakhov/libucl/releases/tag/0.9.2
The entire changes from the current version 0.8.0 to 0.9.2 are available here: https://github.com/vstakhov/libucl/compare/0.8.0...0.9.2