Incorrect validation for possible values. The valid values are: 25 or 100 but should be 1, 25, 100, 250

[GeekHare]

I run into an issue with validation of price points in BitfinexOrderBookSymbol.

In the official documentation said the following: Number of price points ("1", "25", "100", "250") [default="25"]
Please, have a look at Request Fields -> LENGTH

[GeekHare]

Hello @jnidzwetzki, I've prepared a PR, please, take a look at it #316