Add real separating on optional and non-optional fields in answer

[PerchunPak]

I debugged code for 10+ hours and found that ID returns ALWAYS.

P.S. Could you please fix all repos, so they will compilate. I really tried, but it seems like they all broken.
(fix means make Github CI working, because there is no way to know how compilate it)

[PerchunPak]

After creating #9 I found for me SpigetRestFetcher.java, so debugging will be much more easier as this last edition point for API answer.

@InventivetalentDev. seems like you using custom server for generating wiki in production. Can I get please name of this tool, for finding docs how should I document optional and not fields?