chore(package): update dragula to version 3.6.3
chore(package): update dragula to version 3.6.3

http://greenkeeper.io/
annraoi/Drag-And-Drop-by-Dragula,readelobdill/ng2-dragula,annraoi/Drag-And-Drop-by-Dragula,valor-software/ng2-dragula,aggo/ng2-dragula,NathanWalker/ng2-dragula,NathanWalker/ng2-dragula,valor-software/ng2-dragula,valor-software/ng2-dragula,NathanWalker/ng2-dragula,aggo/ng2-dragula