Martin von Zweigbergk <martinvonz@google.com> [Fri, 06 Mar 2020 14:35:35 -0800] rev 5258
build: make docs/conf.py compatible with py3
I don't even know what this file does, but it made our Debian build
fail on py3 because it attempted to pass unicode to
`mercurial.ui.setconfig()`.