Add kind 30079 in NIP-78 (#1503)

[ShinoharaTa]

Fix to #1503

[staab]

By convention (and implementation) kind 3xxxx are always parameterized replaceable events, you should choose something in the range 100-9999 for non-replaceables.

[ShinoharaTa]

Ok, I selected Kind 7078.

[ShinoharaTa]

Thanks.

[mikedilger]

I think 7078 is going to need at least 1 tag to distinguish different apps from each other. The replaceable event as the 'd' tag.

Personally I may use this for my gossip relay test injected events as 7078 but I'll want to isolate them from other uses with some tag of some sort.