Spawn Elytra

I fixed an oversight on my end where the Spawn Elytra doesn't work in Adventure Mode. I also added an new option in the config:

# If you don't want to disable elytra in adventure mode, set this to false
disable_in_adventure: false

so if you do want that the spawn elytra does not work in adventure you can set it to true.

This issue was submitted on github, if you find any more issues or have suggestions to improve the plugin, feel free to create an "suggestion" issue

I also plan on reducing the frequency in update notifications

Thanks for 600 Downloads!