(android) Add required versions to support adaptive icons (#1016)

* Add required versions to support adaptive icons

Co-Authored-By: エリス <erisu@users.noreply.github.com>
diff --git a/www/docs/en/dev/config_ref/images.md b/www/docs/en/dev/config_ref/images.md
index b38cc01..545219c 100644
--- a/www/docs/en/dev/config_ref/images.md
+++ b/www/docs/en/dev/config_ref/images.md
@@ -54,7 +54,7 @@
 
 ## Android
 
-On Android, instead of using a single image for an icon, you can use two images (background and foreground) to create an **Adaptive Icon**.
+On Android, instead of using a single image for an icon, you can use two images (background and foreground) to create an **Adaptive Icon**. To use Adaptive Icons, you need to have installed at least version 9.0.0 of **Cordova** and version 8.0.0 of **Cordova-Android**.
 
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