Trying a CI test against two different vips versions

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ jobs:
     strategy:
       matrix:
         ruby-version: ['2.7.5', '3.0.3', '3.1.3', '3.2.2']
+        vips-version: ['8.14.5', '8.15.0']
     env:
       NOKOGIRI_USE_SYSTEM_LIBRARIES: true
 
@@ -46,9 +47,9 @@ jobs:
 
           # Download and compile selected version of vips
           cd /tmp
-          wget https://github.com/libvips/libvips/releases/download/v8.15.0/vips-8.15.0.tar.xz
-          tar xf vips-8.15.0.tar.xz
-          cd vips-8.15.0
+          wget https://github.com/libvips/libvips/releases/download/v${{ matrix.vips-version }}/vips-${{ matrix.vips-version }}.tar.xz
+          tar xf vips-${{ matrix.vips-version }}.tar.xz
+          cd vips-${{ matrix.vips-version }}
           meson build --libdir=lib --buildtype=release -Dintrospection=disabled
           cd build
           ninja

README.md

@@ -1,8 +1,6 @@
 # imogen
 derivative generation and smart square thumbnail via libvips.
 
-NOTE: imogen >= 0.4.0 requires libvips >= 8.15 (to support the vips `revalidate` feature when reading in an image).
-
 ## Scale and re-format an image
 ```ruby
   Imogen.with_image('example.tiff') do |img|
@@ -11,13 +9,14 @@ NOTE: imogen >= 0.4.0 requires libvips >= 8.15 (to support the vips `revalidate`
   end
 ```
 
-## Scale and re-format an image, skipping any vips caching and re-reading in the source image
+## Scale and re-format an image, using the revalidate option to skip any vips caching and re-reading in the source image
 ```ruby
   Imogen.with_image('example.tiff', { revalidate: true }) do |img|
     # img is a FreeImage::BitMap
     Imogen::Scaled.convert(img, 'example-150.jpg', 150)
   end
 ```
+Note: The above usage requires libvips >= 8.15
 
 ## Perform "interesting region" detection
 ```ruby