Update release notes

Author: oschwald

Changes.md

@@ -1,8 +1,12 @@
-## 1.8.1
+## 1.9.0 - 2024-01-09
 
 * On very large databases, the calculation to determine the search tree
   size could overflow. This was fixed and several additional guards
   against overflows were added. Reported by Sami Salonen. GitHub #335.
+* Removed `sa_family_t` typedef from the public header on Windows. Pull
+  request by Noah Treuhaft. GitHub #334.
+* The CMake build was adjusted to allow running builds in parallel.
+  Pull request by Vladyslav Miachkov. GitHub #332.
 
 ## 1.8.0 - 2023-11-07