Fix: Add User-Agent header to Vintage Story master server request

[nunopaiva1]

The Vintage Story master server returns HTTP 403 unless a valid User-Agent is provided.

This change adds a proper User-Agent header to allow successful querying.

[CosminPerRam]

Please also add a line in the CHANGELOG.md file.

[CosminPerRam]

Please add a end file new line

[nunopaiva1]

All set. I added the changelog entry and the newline as requested. Let me know if anything else needs changing!

[tyronx]

This has been blocked by us on purpose because users of this software are completely overloading our services. It is being spammed to no end. To whoever uses this software, please refrain from using our online service to get your own servers player count - read it out from the /stats command.

That being said, we can look into a more straightforward solution at some point in the future.

Kindly request this to be reverted again.

[CosminPerRam]

@tyronx is the /stats available via RCON (or some other remote way) in the base game? If so, we can switch to it, but if not, even if we stopped doing this and completely remove the support of the game, someone else would eventually come back to this (i.e. users just forking and applying this fix), if you'd plan to revamp the performance of the endpoint (i.e. caching, pagination or adding a whole different way of quering data directly to the servers) we could wait if that's something not taking a long while.

If RCON or other ways are not available (and not planned to), we would add an API option for users to specify this header (so people would have to acknowledge this problem).

Sorry for the very late response.