Feature request

Feature description
This is a minor request, as it only is about a specific message.

When you either delete or unload a world will MV post the message that the world has been removed from memory twice.

For example, executing mvdelete example followed by mvconfirm gives back those log entries.

[15:12:27] [Server thread/INFO]: [Multiverse-Core] World 'example' was unloaded from memory.
[15:12:27] [Server thread/INFO]: ThreadedAnvilChunkStorage (example): All chunks are saved
[15:12:27] [Server thread/INFO]: [Multiverse-Core] World 'example' was unloaded from memory.
[15:12:27] [Server thread/INFO]: [Multiverse-Core] World 'example' was removed from config.yml
[15:12:27] [Server thread/INFO]: [Multiverse-Core] World 'example' was DELETED.

As you can see is the message World 'example' was unloaded from memory. posted twice. Once when it starts and once when the world was actually unloaded.

I want to suggest to change the first message to a different one, if doable. Something like Attempting to unload World 'example' from memory...

How the feature is useful
Mainly to prevent any possible confusion as to why this message pops up twice.
As I said is this a really minor visual issue and barely anyone may notice this, but it would still be good to correct this in some way.