Fix CIDR

Currently GH uses the [https://api.github.com/meta](https://api.github.com/meta)

``` json
{

    "verifiable_password_authentication": true,
    "hooks": [
        "192.30.252.0/22"
    ],
    "git": [
        "192.30.252.0/22"
    ]

}
```

We currently only allow 256 hosts when the `/22` means allow 1024 hosts/broadcasts ranging from 192.30.252.0 to 192.30.255.255 from them. While we may not need this many just yet there is no guarantee that the first 256 are not in use *(to any project)* and we might *(not)* get a WebHook notice or notice from the other 75% of the missed IPs.