Hello, Good Morning I would suggest adding the nLogin Plugin. To protect the servers, from what I've seen it is one of the best Login plugins. Protects from Bots and Thefts. In addition to being constantly updated it is currently in version 1.14X of minecraft.
It is located at: https://www.spigotmc.org/resources/nlogin-1-7x-1-14x.57272/ (and Information)
Please add! 
