delete.md in jets-3.0.12

- old
+ new

@@ -15,8 +15,8 @@
     Stack demo-dev deleted.
     Time took for deletion: 1m 27s.
     Project demo-dev deleted!
     $
 
-You can bypass the are you sure prompt with the `--sure` flag.
+You can bypass the are you sure prompt with the `--yes` flag.
 
-    $ jets delete --sure
+    $ jets delete --yes