sbws install doc is confusing

https://gitweb.torproject.org/sbws.git/tree/INSTALL.rst#n25

Doesn't state need for python3, and the reference to stem 1.7.0 is confusing. Just stated you want the master branch, and ignore versions for now. Master is 1.6.0dev0 right now, and there is no 1.7.0.

Trac:
Username: gabe