new pattern in sudo rule

`pacman-key --refresh-keys` outputs the following when not run as root

```
==> ERROR: pacman-key needs to be run as root for this operation.
```

thefuck/rules/sudo.py

@@ -14,6 +14,7 @@ patterns = ['permission denied',
             'must be root',
             'need to be root',
             'need root',
+            'needs to be run as root',
             'only root can ',
             'You don\'t have access to the history DB.',
             'authentication is required',