Stateful switch not retrieving status after Homebridge restart
After restarting homebridge, the **stateful** http switch doesn't call to get its initial status, it gets status only when the switch is actively changed.

If the switch is on after restarting homebridge I would expect it to be initialized as "on".

I also tried to play with the "statusCache" option but it doesn't seem to fix it.

─ homebridge @ **0.4.52** 
─ homebridge-http-switch @ **0.5.27** 

**Configuration**
```json
{
            "accessory": "HTTP-SWITCH",
            "name": "Marantz",
            "switchType": "stateful",
            "debug": false,
            "pullInterval": 2000,
            "statusCache": -1,
            "onUrl": {
                "url": "http://10.0.0.6:8080/goform/AppCommand.xml",
                "method": "POST",
                "body": "<?xml version=\"1.0\" encoding=\"utf-8\" ?><tx><cmd id=\"1\">SetPower</cmd><zone>Main</zone><value>ON</value></tx>",
                "headers": {
                    "Content-Type": "application/xml"
                }
            },
            "offUrl": {
                "url": "http://10.0.0.6:8080/goform/AppCommand.xml",
                "method": "POST",
                "body": "<?xml version=\"1.0\" encoding=\"utf-8\" ?><tx><cmd id=\"1\">SetPower</cmd><zone>Main</zone><value>STANDBY</value></tx>",
                "headers": {
                    "Content-Type": "application/xml"
                }
            },
            "statusUrl": {
                "url": "http://10.0.0.6:8080/goform/AppCommand.xml",
                "method": "POST",
                "body": "<?xml version=\"1.0\" encoding=\"utf-8\" ?><tx><cmd id=\"1\">GetAllZonePowerStatus</cmd></tx>",
                "headers": {
                    "Content-Type": "application/xml"
                }
            },
            "statusPattern": ".*ON.*"
        }
```
