Updated README.md

Author: khalwat

README.md

@@ -7,6 +7,7 @@ Uninstall misbehaving plugins from the command line.  Usage: `./craft/app/etc/co
 1. Unzip file and place `uninstall` directory into your `craft/plugins` directory
 2.  -OR- do a `git clone https://github.com/khalwat/uninstall.git` directly into your `craft/plugins` folder.  You can then update it with `git pull`
 3. Install plugin in the Craft Control Panel under Settings > Plugins
+4. The plugin folder should be named `uninstall` for Craft to see it.  GitHub recently started appending `-master` (the branch name) to the name of the folder for zip file downloads.
 
 ##What's it for?