Update deltachat-jsonrpc/src/api/types/appversions.rs

Co-authored-by: holger krekel  <holger@merlinux.eu>

deltachat-jsonrpc/src/api/types/appversions.rs

@@ -13,6 +13,8 @@ pub struct JsonrpcAppSource {
     pub version_string: String,
 
     /// Where to download that version.
+    /// Security note: consumers need to verify themselves 
+    /// that downloaded app files are valid before installing them.
     pub download_url: String,
 }