Encountered a bug

```
Traceback (most recent call last):
  File "/usr/bin/archey", line 261, in <module>
    out.append(classes[x]())
  File "/usr/bin/archey", line 215, in __init__
    used = int(ram[2]) - int(ram[5]) - int(ram[6])
IndexError: list index out of range
```

Used the version currently available in the AUR.
