[josm-dev] Plugin changelog

[Josh Doe]

I noticed Simon added some plugin changes to the changelog here:
http://josm.openstreetmap.de/wiki/Changelog

I had been adding such changes here:
http://josm.openstreetmap.de/wiki/Plugin%20changelog

We should stick to one, but which one? I didn't want to touch the
first without asking about it, so I used the second, though the first
gives more visibility. My only issue with that is that plugin versions
aren't tied to core versions (unless min version changes).

-Josh