tmux.conf: Set renumber-windows off

tmux.conf

@@ -24,7 +24,7 @@ bind C-o command-prompt -p "session name to switch to:" \
 
 set -g base-index 1
 set -g pane-base-index 1
-set -g renumber-windows on
+set -g renumber-windows off
 setw -g mode-keys vi
 setw -g mode-mouse off
 #set -g default-command /bin/bash