Add 'lt' -- as ll but sorted according to time

dotfiles/bash/main.bashrc

@@ -469,6 +469,7 @@ alias cls='clear'
 alias czkrates='czkrates -v'
 alias ll='ls -lh'
 alias lla='ls -lha'
+alias lr='ll -lhrt'
 alias open='gnome-open'
 alias diff='colordiff -u'
 alias dmesg='dmesg --time-format iso'