Tweak prune note

Ilya Radchenko · Ilya Radchenko · commit 4ea3f4f8790b · 2017-02-19T19:21:30.000-05:00
diff --git a/README.md b/README.md
@@ -98,7 +98,7 @@ Options:
 
 ### pruneJobs
 
-Cleanup all jobs except for the latest 20 or custom
+Cleanup/prune all jobs except for the latest 20 or custom (use `-k [your number]`)
 
 ```
 Options:
