Revert "Revert "Add Vault as a softdepend to the Bukkit variant to prevent a warning from Spigot""

This reverts commit 376f241b7dfbe3cf221adaae340661d0c9a5c81f.

Spigot bad. Also LP bad. This really shouldn't be necessary but it's
probably safer due to all the weird shit spigot and LP do.

(cherry picked from commit 68d48148d3df6e01815d05c462ba22498734fdc4)

worldedit-bukkit/src/main/resources/plugin.yml

@@ -3,6 +3,7 @@ main: com.sk89q.worldedit.bukkit.WorldEditPlugin
 version: "${internalVersion}"
 load: STARTUP
 api-version: 1.13
+softdepend: [Vault]
 website: https://intellectualsites.github.io/download/fawe.html
 description: Blazingly fast world manipulation for builders, large networks and developers.
 authors: [Empire92, MattBDev, IronApollo, dordsor21, NotMyFault]