~/.tmux.conf: Source ~/.tmux.conf using `<C-b>r`.

.tmux.conf

@@ -30,3 +30,5 @@ bind-key -n F5 select-window -t 4
bind-key -n F6 select-window -t 5
bind-key -n F7 select-window -t 6
bind-key -n F8 select-window -t 7
bind-key r source-file ~/.tmux.conf