Codemod `url-sandbox` could also support `from urllib.request.urlopen`

[clavedeluna]

This codemod currently handles making requests with the requests library, but requests can also be made with the builtin urllib.request library

[andrecsilva]

This is blocked until the python-security can support urllib.request.urlopen calls. However tests are failing for that package at the moment.
See:
pixee/python-security#20