[tmux] increased scrollback up to 10k lines

tmux.conf

@@ -2,6 +2,7 @@ set -g default-terminal "screen-256color"
 set -g mouse on
 set -g set-clipboard external
 set -g escape-time 10 # https://www.johnhawthorn.com/2012/09/vi-escape-delays/
+set -g history-limit 10000
 set-option -g status-position top
 set-window-option -g allow-rename off
 set allow-rename off