Typo in the `openmed.prod.sample` file

[lucavenir]

The file openmed.prod.sample has a typo:

{
    "publicHostname": "<your-host-name>",
    "publicPort": 443,
    "publicIp: "<your-public-ip>",
    "mongodbUrl": "mongodb://<your-mongo-username>:<your-mongo-password>@<your-mongo-host-name>:27017/<your-mongo-database-name>",
    "gmailUsername": "<your-gmail-address>",
    "gmailPassword": "<your-gmail-app-password>",
    "ssslCert": "/etc/letsencrypt/live/<your-host-name>/fullchain.pem",
    "sslKey: "/etc/letsencrypt/live/<your-hostname-name>/privkey.pem"
}

I'm correcting it now.

[lucavenir]

Done in dev branch

[lucavenir]

There was another typo in here that's probably causing the conference not to work

[lucavenir]

Fixed with PR #60