v0.11.0

• mq-sendmail: a bare-bones CLI script which can replace /usr/bin/sendmail
• CLI scripts now load config from well-known locations by default (~/.mailqueue-runner.conf, /etc/mailqueue-runner.conf)
• PuzzlePluginSystem is now an optional dependency
• dropped support for Python 2
• provide dnf repository for Fedora and EL9
• fix exception in message logging when email contained 8 bit characters