Bug report: Update readme.md and other descriptions of plugins on different platforms

[sall0-0p]

My fellow admin and I were trying to make sure that players data is getting saved, and we followed permissions from Spigot and GitHub. We assigned permissions starting with inventoryrollback and were not able to resolve issue until I looked into your code and saw that I need to use inventoryrollbackplus permissions.

[TechnicallyCoded]

Thank you for the report :)