Use mergeSingle instead of merge to clone object key

Author: astefanutti

lib/client.js

@@ -382,7 +382,7 @@ function mergeSingle(target, source) {
     if (typeof prop === 'object' && Object.prototype.toString.call(prop) === '[object Object]') {
       // Only deep copy Object
       if (!target[key]) target[key] = {};
-      merge(target[key], prop);
+      mergeSingle(target[key], prop);
     } else if (key === 'path') {
       target.path = URI.joinPaths(target.path || '', source.path || '')
         .setQuery(URI.parseQuery(URI.parse(target.path || '').query || ''))