Don't delete query values after formatting

They may be useful to other users of the query object

Author: grncdr

lib/Connection.js

@@ -105,7 +105,6 @@ Connection.prototype.query = function(sql, values, cb) {
   }
 
   query.sql = this.format(query.sql, query.values || []);
-  delete query.values;
 
   return this._protocol._enqueue(query);
 };