docs: added $deeplink_path to docs

Author: ethanneff

README.md

@@ -328,6 +328,7 @@
         $android_url: 'http://www.example.com/android',
         $ios_url: 'http://www.example.com/ios',
         $ipad_url: 'http://www.example.com/ipad',
+        $deeplink_path: "content/123",
         more_custom: 'data',
         even_more_custom: true,
         this_is_custom: 321