correct plugin.yml

change "Wackyorb" to "Whackyorb" 
- CombatTag spelt my name wrong (or right depending how you look at it)

change "author" to "authors"
- "author" is used when there is one author

update "main" to point to the corrent place
- the name of the package containing the main class change since the
plugin.yml was writen