fix: handle multi-export single module repo

Author: achingbrain

src/docs/readme-updater-plugin.js

@@ -27,11 +27,16 @@ export function load (app) {
         return false
       }
 
-      // single-module repo
+      // single-module repo, single export
       if (urlMapping.url === 'modules.html') {
         return true
       }
 
+      // single-module repo, multiple export
+      if (urlMapping.url === 'modules/index.html') {
+        return true
+      }
+
       // mono-repo and the model name matches a package name
       if (isMonorepoParent && projects[urlMapping.model.name] != null) {
         return true