IW: Node.js no longer defines querystring as a global module

As of node.js 10.21, it seems that `querystring` is no longer defined as a global. What is stranger is that querystring is loaded in the repl, but not in the module scope. 

The node.js manual also does not seem to list querystring as a global. 

http://nodejs.org/api/globals.html#globals_global

Please let me know if you would rather have a patch file. 

Thank you.