Service query is overflowing

[Luftzig]

by sending the length the header instead of the just 4 needed bytes.
See #7

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[gigaj0ule]

This PR fixes a critical bug!

Without it we get weird buffer overruns in the processing logic that cause malformed packets.

@agdl, @marqdevx, does this library have any maintainers?

If not you can add me as one and I will upstream this as well as try to merge the sensible future commits from trippylightning's branch.

[zyphlar]

Removing a call to addServiceRecord made this library way more reliable for me @aentinger