Release n2.6.2.2

Just a small fix. Before, when you called forward(payload), all the values of a dict-like payload were casted into strings (with the purpose to delete those keys, where the value was an empty Naemon macro). Now this happens only if the value is not a list or dict. So, for example, you can now receive a dict from a Prometheus Alertmanager and put it into forward() (in order to send the alarms to ServiceNow)