Revert "Merge pull request #35 from C0D3-M4513R/patch-1"

This reverts commit db1cdad4e1, reversing
changes made to 9f66570088.

Common/src/main/java/dev/brighten/antivpn/command/impl/PlanCommand.java

@@ -95,6 +95,6 @@ public class PlanCommand extends Command {
 
     @Override
     public List<String> tabComplete(CommandExecutor executor, String alias, String[] args) {
-        return Collections.emptyList();
+        return null;
     }
 }