Add missing magic attributes to the "+X to Maximum Y Damage"

[artcom-net]

Cold and lightning attributes are missing. IDs 51 and 55, respectively.
I fixed this problem in my Python library artcom-net/d2lib#2 .
If I find the time I will make a pull request.

[nokka]

Thanks! 👍 Do you know any items these attributes appear on so I can test it out?