fixing orientdb username var

app/services/orientdb_service.rb

@@ -14,7 +14,7 @@ class OrientdbService
       orientdb_configs = YAML.load_file Rails.root.join('config').to_s.concat('/orientdb.yml')
       configs = orientdb_configs.fetch(Rails.env)
 
-      {host: configs['host'], database: configs['database'], user: configs['user'], password: configs['password'], port: configs['port'], ssl: configs['ssl']}
+      {host: configs['host'], database: configs['database'], user: configs['username'], password: configs['password'], port: configs['port'], ssl: configs['ssl']}
     end
   end
 end