Quiet warnings for utf8 options
Quiet warnings for utf8 options

Tmux 2.2 removed `utf8` and `status-utf8` options. Since we still want
to keep these options for earlier tmux versions we're redirecting the
output to /dev/null when setting these commands. This way tmux 2.2 (and
above) users won't get any errors when running this plugin.

tmux-plugins/tmux-sensible