Could not start playing

Hello there,

I got this error when following the README.


```
$ ./launchcontrol -insecure -buttplug ws://localhost:12345/buttplug
...
2020/05/25 17:10:02 /v1/play (POST)
2020/05/25 17:10:02 Kiiroo stats: 4 actions
2020/05/25 17:10:02 Connected to Buttplug Intiface Server (0.0.0)
2020/05/25 17:10:12 Internal server error, could not discover launch
```

Is it normal ?