This adds the _version: 1 correctly to the body of the HTTP POST.
Additionally, this fixes the imports when using secrets.
The POSTed JSON body now is:
```json
{
"_check_id": "046cac59e2aa3000",
"_check_name": "High CPU User Usage",
"_level": "crit",
"_measurement": "notifications",
"_message": "High CPU User Usage: rsavage.prod is crit",
"_notification_endpoint_id": "046cad0c83aec000",
"_notification_endpoint_name": "HTTP Endpoint",
"_notification_rule_id": "046dff53d4183000",
"_notification_rule_name": "HTTP Notification",
"_source_measurement": "cpu",
"_source_timestamp": 1567797375000000000,
"_start": "2019-09-06T19:15:59Z",
"_status_timestamp": 1567797376416632300,
"_stop": "2019-09-06T19:16:20.362006739Z",
"_time": "2019-09-06T19:16:20.609629338Z",
"_type": "threshold",
"_version": 1,
"cpu": "cpu-total",
"host": "rsavage.prod",
"usage_user": 91.12278069517379
}
```
dbcdc8dc59