add common to cp

Author: Michael Cooper

graphics-aria/.travis.yml

@@ -20,7 +20,7 @@ script:
   - cd gh-pages
   - git clone --depth=1 --branch=gh-pages https://github.com/w3c/graphics-aria.git
   - cd graphics-aria
-  - cp -r ../../w3c/graphics-aria/img .
+  - cp -r ../../w3c/graphics-aria/common ../../w3c/graphics-aria/img .
   - curl https://labs.w3.org/spec-generator/?type=respec"&"url=https://raw.githack.com/w3c/graphics-aria/main/index.html -o index.html -f  --retry 3
 
 after_success: