[Twisted-Python] New Supported Platforms - FreeBSD (2.7 & 3.5), Python 3.6 (Linux)

Hi everyone, I just migrated a few buildbots over to the 'supported' column. This includes Python 3.6 on Ubuntu 16.04 (compiled, not an official distro binary :) ) and FreeBSD 10.1 (Python 2.7 & 3.5). Twisted 16.7 passes on both of these, so you can consider them supported platforms for it. - Amber