feture-request: option to deactivate "added custom placeholder" message

[RedstoneFuture]

Hello,

It would be good to have a new option to deactivate the "added custom placeholder" message from this code line to prevent log-spam on startup with plugins there create many custom placeholders.

[12:39:36] [Server thread/INFO]: [MVdWPlaceholderAPI] PlotSquared added custom placeholder {plotsquared_currentplot_localflag_description}

For example, the plugin PlotSquared create 194 lines of messages with this reason on server startup.

I know, it needs a new main config for MVdWPlaceholderAPI to allow options like this, so I'm not sure if it's important enough for this change. But it's an idea.