Update libvips version in README

Author: tpyo

crates/lib/README.md

@@ -22,7 +22,7 @@ cargo add shrinkray
 
 ### System Dependencies
 
-- **libvips 8.18.0**
+- **libvips 8.18.2**
 - libaom (for AVIF support via libheif)
 - libheif
 - libjpeg