Remove 1d1 (Illogical die configuration).

[infoburp]

1d2 is a coin, but 1d1 is a pointless die, as it always has the same result (1).

[infoburp]

There are other problems, for example "dice 0.1d0.1" is considered valid. I'll take a better look at this over the next few hours..

[infoburp]

Thanks for the feedback in your stream, Fredrick. As is this patch works (prevents 1d1), but it still accepts silly inputs like 1d1.1. I'm just setting up a local testing server so I can submit good code, and I'm happy to open another PR if/when you accept/close this one.

[infoburp]

As I said in the stream, my next PR will hopefully modify more than 1 char...

[anonfagola]

The code says it "intifies" the numbers, so decimals shouldn't be a problem.

[infoburp]

Ok, but a one sided die still makes no logical sense, as it always returns 1...