a relay serving broken json should not block discovery of others

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

@@ -13,7 +13,7 @@ pub struct JsonrpcAppSource {
     pub version_string: String,
 
     /// Where to download that version.
-    /// Security note: consumers need to verify themselves 
+    /// Security note: consumers need to verify themselves
     /// that downloaded app files are valid before installing them.
     pub download_url: String,
 }