Add a missed comma to readme

README.md

@@ -14,8 +14,8 @@ build tool.  The syntax is Rake-like, so it should be familiar to most Rake
 users.
 
 Please note: Thor, by design, is a system tool created to allow seamless file and url
-access, which, should not receive application user input. It relies on [open-uri][open-uri],
-which combined with application user input, would provide a command injection attack
+access, which should not receive application user input. It relies on [open-uri][open-uri],
+which, combined with application user input, would provide a command injection attack
 vector.
 
 [rake]: https://github.com/ruby/rake