Update changelog with new native binary information

Author: Edward Thomson

CHANGES.md

@@ -16,6 +16,10 @@
 
 ### Changes
 
+ - The native libraries are now expected to be in the `lib` directory,
+   instead of `NativeBinaries` for improved mono compatibility.  In
+   addition, the names of platform architectures now better reflect
+   the vendor naming (eg, `x86_64` instead of `amd64` on Linux).
  - Obsolete the config paths in RepositoryOptions
 
 ### Fixes